Re: [LON-CAPA-users] Setting weight by floating point

[Harding, Gene L via LON-CAPA-users]

Hi HK,

If I understand your question correctly, you want to set the weight for a 
homework/quiz problem or problem part. If that is correct, there are multiple 
ways to do that. I don't know if there is a way to set the default point value 
in a problem's code, but I normally do it from within the course where the 
problem is part of quiz/homework, inside a folder.

The most frequent way I use personally is to go to Settings on the top level 
menu, then Content Settings. In that window, select the folder containing the 
problem(s). In part 2 you can select which parameters to set, including dates, 
time limit, weight, etc. I usually go with the defaults plus the Time-limit 
parameter. Click the Update Display button at bottom left. You will get a 
window showing those parameters and their current values. Click on the value of 
the weight parameter and set it to the value you want. I use decimal numbers 
all the time. Note that the value you specify in this window will apply equally 
to all problems/parts in the homework/quiz in that folder. For instance, if you 
have a quiz with four problems, each having two parts, and want a 100-point 
quiz, set the Weight to 12.5. Each part will be worth 12.5 points, making each 
problem worth 25 points, making the quiz worth a total of 100 points.

Occasionally, I have a need to set problem parts to different values, rather 
than distributing the points equally across the parts. To do that, navigate to 
the problem from the high-level Contents tab, then select Content Settings on 
the Functions line. In the table that opens, you can set the point value 
applied to each problem. Or, if you check the Show all parts box and Update 
Display button, you can set the weight individually for each problem part.

Hope that helps.

Best regards,

Gene L. Harding, PE
Associate Professor of ECET

From: LON-CAPA-users  On Behalf Of 
H.K. Ng via LON-CAPA-users
Sent: Friday, May 14, 2021 6:55 PM
To: Discussion list for LON-CAPA users 
Subject: [LON-CAPA-users] Setting weight by floating point

Hi,

How does one set the weight by floating point? I have a course that is set that 
way but I can't remember how that was done. My current course only has options 
for integers ... Thanks.

Regards,
-hk

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Re: [LON-CAPA-users] Presenting Lon-Capa on IPS conference next week

[Harding, Gene L via LON-CAPA-users]

Hi Itay,

What I normally say, and plan to say at a LON-CAPA workshop this April at the 
IL-IN ASEE conference, is that I have never seen or heard of an LMS that can 
even approach the problem-generating capabilities of LON-CAPA. That is 
absolutely true, but leaves the door open for someone to enlighten me. (No one 
has yet.)

Before LON-CAPA I used Blackboard Vista. It was BB's transition to Learn, in 
which they dropped some of the most important aspects of what was a meager 
problem-generation capability, that led to my introduction to LON-CAPA. Purdue 
uses Brightspace (formerly D2L, I think) now, but I have not explored its 
problem-generating capacity. If you learn of a recent LMS comparison, please 
let me know.

BR,

Gene L. Harding, PE
Associate Professor of ECET

From: LON-CAPA-users  On Behalf Of 
Itay via LON-CAPA-users
Sent: Tuesday, February 16, 2021 12:00 PM
To: Discussion list for LON-CAPA users 
Subject: [LON-CAPA-users] Presenting Lon-Capa on IPS conference next week

Hi

Next week (Monday) I will do a short demonstration of Lon-Capa (LC) on the 
Israel Physical Society annual conference.
I got 15 minutes in the Physics Education session.
The backbone of the presentation would be showcasing 2-3 problems that 
demonstrate the strong problem-engine of Lon-Capa.  I anticipate there might be 
questions from the audience asking to compare LC to other systems (I have some 
experience only with moodle).

So I wonder if any of you could help me with these questions?


  1.  Do you know of any recent and published comparison of Lon-Capa (LC) with 
other LMS's?
  2.  In particular: LC vs.  WebWork and/or Stack?
  3.  Can I reasonably claim that LC has (one of) the strongest 
problem-engine(s) in the market?
  4.  If you believe the answer for 3 is 'yes' : what would be the supporting 
evidence.
Thank you in advance.
You are welcome to reply in private if you prefer.

Itay
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Re: [LON-CAPA-users] Student teams (groups)

[Harding, Gene L via LON-CAPA-users]

Hi Susan,

The only way I know to do it is one group at a time from the People tab at the 
top: People --> Groups, then fill out the info on that page, click Next, check 
any optional privileges desired, check the names of students for that group, 
Next, fill out the last page if applicable, and click Create Group.

If there is an easier way to do it, I'm not aware of it.

Best regards,

Gene L. Harding, PE
Associate Professor of ECET

-Original Message-
From: LON-CAPA-users  On Behalf Of 
Susan Masten via LON-CAPA-users
Sent: Saturday, January 30, 2021 2:12 PM
To: lon-capa-users@mail.lon-capa.org
Subject: [LON-CAPA-users] Student teams (groups)

Greetings and I hope you're all having a relaxing weekend.

I have an excel file where I've assigned students to teams (groups). Is there 
an easy way to assign them to the same teams on LON-CAPA? I'm not seeing 
anything in the new manual.

Thanks

Susan Masten
Michigan State University


--
Be well, keep hope, seek justice.

Privileged to be working at home.
-- 

Susan J. Masten, Ph.D., P.E.
Professor
Department of Civil and Environmental Engineering Engineering Building 3505
428 S. Shaw Ln., Room 3546
East Lansing, MI 48824

Phone: 517 355-2254
Fax: 517 355-0250

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Re: [LON-CAPA-users] How to mark certain responses to be hand-graded?

[Harding, Gene L via LON-CAPA-users]

Hi Itay,

I have never done this, but have noticed this semester that, when I create 
dropboxes for assignments, there is a parameter "handgrade" that I do not see 
in my normal quiz questions. I just tried, and was not able to "force" the Hand 
Grade parameter to show up for one of my quiz questions, so I'm not sure if it 
is possible.

If not, perhaps you could set a code in one of the other parameters. It would 
be a bit kludgy, but what if you set the score to 150 instead of somewhere in 
the 0-100 range to "flag" those problems? When you download the grades to a 
spreadsheet you could sort them by score. Any 150's would be at the top so you 
would know which ones to hand grade. This is not a great solution, and 
hopefully someone will have a better idea, but if not, since they are rare 
perhaps something like that could work...

Best regards,

Gene L. Harding, PE
Associate Professor of ECET

From: LON-CAPA-users  On Behalf Of 
Itay via LON-CAPA-users
Sent: Saturday, December 12, 2020 12:19 PM
To: Discussion list for LON-CAPA users 
Subject: [LON-CAPA-users] How to mark certain responses to be hand-graded?

Hi

I am setting up a graphical custom-response problem.
In most cases, there would a solution to the question being asked, and the 
student sould respond with a numerical answer.
However, in rare cases a solution does not exist.

Avoiding these rare cases  in advance or handling them programmatically would 
require a lot of effort.
In contrast, handling them manually would be easy (because this is a graphical 
problem).

So I thought to instruct the students, in case they think there is no solution 
to the problem, to respond with the string 'NA'.  In the customresponse code I 
would intercept this string and mark the problem for that particular student to 
be hand-graded.

Is it possible to do?
If yes: how?

Thank you in advance
Itay
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Re: [LON-CAPA-users] LON-CAPA Error

[Harding, Gene L]

Hi Stuart,

Thank you for your reply. I tried the code you sent, and it works same as the 
old code: correctly when I am logged in as me, but "Unable to understand 
formula" when I log in as a student in the sandbox. I guess I am still confused 
about why it would interpret a formula correctly in one setting, but not in the 
other...

BR,

Gene L. Harding, PE
Associate Professor of ECET

-Original Message-
From: LON-CAPA-users  On Behalf Of 
Raeburn, Stuart
Sent: Saturday, November 7, 2020 2:36 PM
To: Discussion list for LON-CAPA users 
Subject: Re: [LON-CAPA-users] LON-CAPA Error

Gene,

In a formularesponse item, a student's submission will be checked for 
correctness using the maxima CAS, unless sample points were specified in the 
formularesponse tag (in which case CAPA is used to check for correctness via 
sampling; note: σ is not supported as a variable name in this older 
sample-based checking).

The log() function is available in maxima for natural logs, but log10() is not 
available, by default.

If students will be submitting answers that include log10() then one approach 
would be to call a preprocessor routine which would use a call to 
('maxima') to convert the log10(σ) in the submitted expression to natural 
logs, i.e., convert log10(σ) to log(σ)/log(10), before comparison with the 
computer's answer.  Note: in this case the "computer's answer" would need to be 
expressed using natural logs.

Accordingly, the script block would contain:

$radarRCS  = "+10*log(σ)";
$radarRCS2 = "+10*log(σ)/log(10)";

sub convertlogten {
($answer)=@_;
$expr = 'log10(x) := log(x) / log(10); '.$answer;
$answer = ('maxima',$expr);
return $answer;
}

and the formularesponse item would be:




$radarRCS


$radarRCS2





This change is necessary so that if a student submits an answer of:

log10(σ^10)

this will be graded as correct (i.e., for answer name: log10), as it is 
equivalent to 10*log10(σ), which would then be similar to the current behavior 
if a student submits an answer of: 

log(σ^10) 

(i.e., for answer name: log) which is graded as correct as it is equivalent to 
10*log(σ)

Note in the preview, displayed below the textbox used to enter an answer, when 
log10 is typed, the previewer actually displays the 10 as a subscript.

Stuart Raeburn
LON-CAPA Academic Consortium
____
From: LON-CAPA-users  on behalf of 
Harding, Gene L 
Sent: Thursday, November 5, 2020 11:19 AM
To: Discussion list for LON-CAPA users
Subject: [LON-CAPA-users] LON-CAPA Error

Hi,

I am getting an error I don't remember seeing before with a formula response 
problem that takes a Greek letter as part of the formula. The odd thing is that 
it works fine for me, whether in student or course coordinator mode, but not 
for the students. I have been able to recreate the error by logging in as a 
student to a Test course and doing the problem from there. The first time I 
submitted a response it took 20-30 seconds to process, and gave a timeout 
error. Subsequent submissions appear to process much faster, and gave an 
"Unable to understand formula" error. It is set up to take either of two 
formulas for the answer.

Here are the perl script formula definitions:
$radarRCS  = "+10*log(σ)";
$radarRCS2 = "+10*log10(σ)";

This is the formula response code:



$radarRCS


$radarRCS2





This approach works fine for the two preceding problem parts, but they do not 
use the "addchars" modifier with a Greek letter.

Has anyone seen this error before and have an idea of what causes it?

Best regards,

Gene L. Harding, PE
Associate Professor of ECET

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[LON-CAPA-users] LON-CAPA Error

[Harding, Gene L]

Hi,

I am getting an error I don't remember seeing before with a formula response 
problem that takes a Greek letter as part of the formula. The odd thing is that 
it works fine for me, whether in student or course coordinator mode, but not 
for the students. I have been able to recreate the error by logging in as a 
student to a Test course and doing the problem from there. The first time I 
submitted a response it took 20-30 seconds to process, and gave a timeout 
error. Subsequent submissions appear to process much faster, and gave an 
"Unable to understand formula" error. It is set up to take either of two 
formulas for the answer.

Here are the perl script formula definitions:
$radarRCS  = "+10*log(σ)";
$radarRCS2 = "+10*log10(σ)";

This is the formula response code:



$radarRCS


$radarRCS2





This approach works fine for the two preceding problem parts, but they do not 
use the "addchars" modifier with a Greek letter.

Has anyone seen this error before and have an idea of what causes it?

Best regards,

Gene L. Harding, PE
Associate Professor of ECET

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Re: [LON-CAPA-users] Polar Format gnuplots

[Harding, Gene L]

Hi everyone,

My apologies. I should have been more specific about what I am trying to do. I 
want to generate some notional antenna radiation pattern plots showing main 
lobe, back lobe, and side lobes' sizes (both peak gain and beamwidths). These 
plots are normally done with radial values in dB from some negative value up to 
zero or some positive value. The angle values on these plots are typically 
marked in degrees around the perimeter.

I have found some workarounds to get something approximating a polar radiation 
pattern plot. I used the  tag to mark +90 degrees,  to mark -90, 
and yaxis to mark 180, but that does not give great resolution. (The plot grid 
only shows radii every 30 degrees.)

Likewise, I used the axis xformat and yformat parameters, in conjunction with 
the xtics and ytics tags, to mark radial magnitudes, but they only work for 
radial values from 0 to some positive number. If there is a way to do a 
logarithmic scale for the radial values, I cannot figure it out.

After searching through the LON-CAPA Author manual and the gnuplot manual, I 
think this may be as close as I can get to the equivalent of a MATLAB (theta, 
rho) polar plot. It appears to be a limitation of gnuplot, not LON-CAPA.

Does anyone know for sure? Maybe there is a way to do this in Geogebra, but I 
think I may have to compromise for now to get a problem constructed.

My code is below in case anyone wants to see what the plot looks like.

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/


POLAR ANTENNA RADIATION PATTERN PLOT



$amplitude=&random(0.5,3.5,0.5);
$omega=&random(1,2,0.5);
$mainlobe_gain = &random(12,22,1);  # Max antenna gain in dB
$max_plot_radius = 5*&ceil($mainlobe_gain/5);
$backlobe_gain = &random(5,8,1);  # Antenna back lobe gain in dB
$function1 = "$mainlobe_gain * abs(cos(2*t))";
$function2 = "$backlobe_gain * abs(cos(4*t))";



-90
180
+90





 t<$pi/4 ? $function1 : t<7*$pi/8 ? 0 : t<9*$pi/8 ? 
$function2 : t<7*$pi/4 ? 0 : $function1 





The plot at right depicts an antenna's radiation pattern with radial units 
in dB gain. 
What is the peak gain of the main antenna lobe? 
    Amain lobe = 









From: Harding, Gene L
Sent: Friday, May 1, 2020 7:39 PM
To: Discussion list for LON-CAPA users 
Subject: RE: Polar Format gnuplots

Hi Angela,

Thank you for sending that. If you use angular/radial coordinates, do you know 
if there is a way to label the angles around the circular perimeter? I figured 
out how to turn off the Cartesian grid, but need to display angles from 0-360 
or -180 to +180 around the circle instead of x-y coordinates.

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

From: LON-CAPA-users 
mailto:lon-capa-users-boun...@mail.lon-capa.org>>
 On Behalf Of Athanas, Angela
Sent: Friday, May 1, 2020 7:28 PM
To: Discussion list for LON-CAPA users 
mailto:lon-capa-users@mail.lon-capa.org>>
Subject: [LON-CAPA-users] {Disarmed} Re: Polar Format gnuplots

I have a couple of polar area problems. Here's one:



$a=&random(5,10,1); $a1=&random(1,3,1);  $b=$a-1;
for ($x = 0; $x<=2*3.141592654; $x+= 0.01) {
 push @X1, ($a+$b*sin($x))*cos($x);
 push @Y1, ($a+$b*sin($x))*sin($x);
 push @X2, ($a+$b*sin($x))*cos($x); push @Y2, 0;
 push @X3, 0; push @Y3, ($a+$b*sin($x))*sin($x); }
$area=$a**2/2+$b**2/4;
$area1="$area*$pi";
 
 

Determine the area of the right half of the cardioid formed by \[  
r = $a + $b \sin{\theta} \, \]  



 
 @X1
 @Y1
 

 @X2
 @Y2
 

 @X3
 @Y3
 
  

Area of cardioid right half is 








From: LON-CAPA-users 
mailto:lon-capa-users-boun...@mail.lon-capa.org>>
 on behalf of Harding, Gene L mailto:glhar...@purdue.edu>>
Sent: Friday, May 1, 2020 6:03 PM
To: Discussion list for LON-CAPA users 
mailto:lon-capa-users@mail.lon-capa.org>>
Subject: [LON-CAPA-users] Polar Format gnuplots


Hi,



Has anyone done polar-format gnuplots in LON-CAPA? Would you be willing to 
share an example? This is my first foray into polar gnuplots. I am having 
trouble getting the angle to display around the perimeter. It's rendering x- 
and y-axis values instead of angle and radius values.



Best regards,



Gene L. Harding, PE

Associate Professor of ECET

Purdue University

574-520-4190

MailScanner has detected a possible fraud attempt from 
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Re: [LON-CAPA-users] Polar Format gnuplots

[Harding, Gene L]

Hi Angela,

Thank you for sending that. If you use angular/radial coordinates, do you know 
if there is a way to label the angles around the circular perimeter? I figured 
out how to turn off the Cartesian grid, but need to display angles from 0-360 
or -180 to +180 around the circle instead of x-y coordinates.

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

From: LON-CAPA-users  On Behalf Of 
Athanas, Angela
Sent: Friday, May 1, 2020 7:28 PM
To: Discussion list for LON-CAPA users 
Subject: [LON-CAPA-users] {Disarmed} Re: Polar Format gnuplots

I have a couple of polar area problems. Here's one:



$a=&random(5,10,1); $a1=&random(1,3,1);  $b=$a-1;
for ($x = 0; $x<=2*3.141592654; $x+= 0.01) {
 push @X1, ($a+$b*sin($x))*cos($x);
 push @Y1, ($a+$b*sin($x))*sin($x);
 push @X2, ($a+$b*sin($x))*cos($x); push @Y2, 0;
 push @X3, 0; push @Y3, ($a+$b*sin($x))*sin($x); }
$area=$a**2/2+$b**2/4;
$area1="$area*$pi";
 
 

Determine the area of the right half of the cardioid formed by \[  
r = $a + $b \sin{\theta} \, \]  



 
 @X1
 @Y1
 

 @X2
 @Y2
 

 @X3
 @Y3
 
  

Area of cardioid right half is 








From: LON-CAPA-users 
mailto:lon-capa-users-boun...@mail.lon-capa.org>>
 on behalf of Harding, Gene L mailto:glhar...@purdue.edu>>
Sent: Friday, May 1, 2020 6:03 PM
To: Discussion list for LON-CAPA users 
mailto:lon-capa-users@mail.lon-capa.org>>
Subject: [LON-CAPA-users] Polar Format gnuplots


Hi,



Has anyone done polar-format gnuplots in LON-CAPA? Would you be willing to 
share an example? This is my first foray into polar gnuplots. I am having 
trouble getting the angle to display around the perimeter. It's rendering x- 
and y-axis values instead of angle and radius values.



Best regards,



Gene L. Harding, PE

Associate Professor of ECET

Purdue University

574-520-4190

MailScanner has detected a possible fraud attempt from 
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[LON-CAPA-users] Polar Format gnuplots

[Harding, Gene L]

Hi,

Has anyone done polar-format gnuplots in LON-CAPA? Would you be willing to 
share an example? This is my first foray into polar gnuplots. I am having 
trouble getting the angle to display around the perimeter. It's rendering x- 
and y-axis values instead of angle and radius values.

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

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Re: [LON-CAPA-users] Greek Characters in Formula Response

[Harding, Gene L]

Thank you Dave, Mark, Stefan, and Stuart. I got it working. The easiest way I 
found to get the Greek characters was to display them in the LON-CAPA problem 
text, e.g., , then copy them from the displayed problem, return to the 
editor, and paste where needed.
Best regards,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

-Original Message-
From: LON-CAPA-users  On Behalf Of 
Raeburn, Stuart
Sent: Monday, April 20, 2020 9:12 AM
To: Discussion list for LON-CAPA users 
Subject: Re: [LON-CAPA-users] Greek Characters in Formula Response

Gene,

You are referring to this post to the lon-capa-users list:
mail.lon-capa.org/pipermail/lon-capa-users/2014-December/004706.html

which references this demo problem: /res/fhwf/droeschl/misc/addchars.problem , 
which is published Source open.

With your Author role active, when you browse /res/fhwf/droeschl/misc/ , with 
the "Source Available" checkbox checked, you can click "Source Code" to import 
into your Authoring Space.  If you do that, do you get a working problem?

LON-CAPA includes a meta tag in the page header which includes charset=utf-8", 
which tells your web browser which encoding to use.  In the menus on Firefox, 
the "Text Encoding" option, under View, (which allows you to switch encoding) 
is grayed out in the case where a web page includes information about the 
encoding.

As regards editing a problem -- within the LON-CAPA XML editor you will enter a 
comma separated list of the characters in the addchars attribute, whereas 
within the LON-CAPA colorful editor, you will enter the same comma separated 
list in the "Click-On Texts (comma sep)" textbox.

As to how to enter each Greek character, you need to enter the appropriate 
unicode (UTF-8) character.

You could:

(a) use the character map for your particular OS, e.g., see: 
sites.psu.edu/symbolcodes/windows/charmap/ or 
sites.psu.edu/symbolcodes/mac/charview/ 

or

(b) visit: www.unicode.org/charts/U0370.pdf and copy and paste the character

or
 
(c) use a web site (there are many) which provides Unicode Character Search, 
and copy and paste the character you need).

Stuart Raeburn
LON-CAPA Academic Consortium
____
From: LON-CAPA-users  on behalf of 
Harding, Gene L 
Sent: Friday, April 17, 2020 9:33 PM
To: Discussion list for LON-CAPA users
Subject: [LON-CAPA-users] Greek Characters in Formula Response

Hi,

Does anyone know how to do Greek characters in a formularesponse? Someone 
shared a response from Stefan Droeschler several years ago, but I cannot get it 
to work:



$answer="ù+á*t";


 $\omega + \alpha t$ 







Is a cut and paste from MS Word OK for putting the Greek characters into the 
script and addchars statement? If not, how can I do that? Once that is done, 
how do you enter the Greek characters into the formularesponse textline field?

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/<https://urldefense.com/v3/__https://polytechnic.purdue.edu/south-bend/__;!!HXCxUKc!nvo635sbWhA7DBf_tztnMFVFsaCt03Ol2QdE_ZZeVlSqz8iCeE8bA70wl_HRNw$>

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[LON-CAPA-users] Greek Characters in Formula Response

[Harding, Gene L]

Hi,

Does anyone know how to do Greek characters in a formularesponse? Someone 
shared a response from Stefan Droeschler several years ago, but I cannot get it 
to work:



$answer="ω+α*t";


 $\omega + \alpha t$ 







Is a cut and paste from MS Word OK for putting the Greek characters into the 
script and addchars statement? If not, how can I do that? Once that is done, 
how do you enter the Greek characters into the formularesponse textline field?

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

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Re: [LON-CAPA-users] gnuplot problem

[Harding, Gene L]

Hi everyone,

For those who are interested, I finally figured out what the gnuplot issue was, 
and I am stunned. It did not like using 1/4 and 1/2 as coefficients for the 
sin() functions. When I replaced them with 0.25 and 0.5 the plots work fine.

These would not work:
   $fnct_rms_halfwave="1/sqrt(pi) * sqrt(1/2*(pi-x*pi/180) + 
1/4*sin(2*x*pi/180))";
   $fnct_rms_fullwave="sqrt(2/pi) * sqrt(1/2*(pi-x*pi/180) + 
1/4*sin(2*x*pi/180))";

These work fine:
   $fnct_rms_halfwave="1/sqrt(pi) * sqrt(0.5*(pi-x*pi/180) + 
0.25*sin(2*x*pi/180))";
   $fnct_rms_fullwave="sqrt(2/pi) * sqrt(0.5*(pi-x*pi/180) + 
0.25*sin(2*x*pi/180))";

Just thought I'd share what I found in case anyone else runs across this 
problem. Although I don't know the "why", at least I know the "what" that 
caused it. If anyone knows the why, I'd love to know...

BR,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

-Original Message-
From: LON-CAPA-users  On Behalf Of 
raeb...@msu.edu
Sent: Wednesday, April 8, 2020 8:27 AM
To: Discussion list for LON-CAPA users 
Subject: Re: [LON-CAPA-users] gnuplot problem

Hello Gene,

>
> "/home/httpd/perl/tmp/glhardin_purdue_1586186312_6039374_plot.data",
> line 13: expecting ':'
>

Line 13 refers to the line number in the *_plot.data file, which would have 
been in /home/httpd/perl/tmp on the LON-CAPA server from where ITaP retrieved 
the error log information.

Of course by now, nightly clean-up scripts will have removed the *_plot.data 
files from /home/httpd/perl/tmp, so you need to regenerate the error, and have 
ITaP provide you with the *_plot.data file which corresponds with the (new) 
error logged in the web server error logs.

Once you have the *_plot.data file then you could also experiment with that 
outside LON-CAPA, by using it with a version of gnuplot installed locally on 
your own computer.  If you wanted to experiment within the Linux environment, 
but don't use Linux as your primary OS, you could set up a Linux VM using 
VirtualBox (or similar), if you have the memory available to allocate to a VM, 
and install gnuplot there.

Stuart Raeburn
LON-CAPA Academic Consortium
________
From: LON-CAPA-users  on behalf of 
Harding, Gene L 
Sent: Tuesday, April 7, 2020 7:33 PM
To: Discussion list for LON-CAPA users
Subject: Re: [LON-CAPA-users] gnuplot problem

Hi Stuart,

Wouldn't taking the absolute value of the expression inside the sqrt function 
also work? I tried this, thinking it would remove the negative number problem, 
but it did not work:
 $fnct_rms_halfwave="1/sqrt(pi) * sqrt( abs(1/2*(pi-x*pi/180) + 
1/4*sin(2*x*pi/180)) )"; I checked my gnuplot manual, and abs() appears to be 
the correct syntax for absolute value. Wouldn't that fix the negative number 
issue?


These are the lines IT sent me from the error log:
[Mon Apr 06 10:59:07 2020] [error] [client 128.210.56.177] 
"/home/httpd/perl/tmp/glhardin_purdue_1586185147_62400672_plot.data", line 13: 
expecting ':', referer: 
https://urldefense.com/v3/__https://loncapa.purdue.edu/priv/purdue/ecet_purdue/Topics/Power_Electronics/Thyristors/Calc_FiringAngle_using_Graphs_GeogebraInteractive_Multipart.problem__;!!HXCxUKc!gG78S6Qp2qDtQFc0NrfUKzJ4BmC7aOLMiBQ-9GfMLhgv8M9GqPiE0mgQfYzpVQ$

[Mon Apr 06 11:17:06 2020] [error] [client 128.210.56.177] 
"/home/httpd/perl/tmp/glhardin_purdue_1586186225_6003521_plot.data", line 13: 
expecting ':', referer: 
https://urldefense.com/v3/__https://loncapa.purdue.edu/priv/purdue/ecet_purdue/Topics/Power_Electronics/Thyristors/Calc_FiringAngle_using_Graphs_GeogebraInteractive_Multipart.problem__;!!HXCxUKc!gG78S6Qp2qDtQFc0NrfUKzJ4BmC7aOLMiBQ-9GfMLhgv8M9GqPiE0mgQfYzpVQ$

[Mon Apr 06 11:18:32 2020] [error] [client 128.210.56.177] 
"/home/httpd/perl/tmp/glhardin_purdue_1586186312_6039374_plot.data", line 13: 
expecting ':', referer: 
https://urldefense.com/v3/__https://loncapa.purdue.edu/priv/purdue/ecet_purdue/Topics/Power_Electronics/Thyristors/Calc_FiringAngle_using_Graphs_GeogebraInteractive_Multipart.problem__;!!HXCxUKc!gG78S6Qp2qDtQFc0NrfUKzJ4BmC7aOLMiBQ-9GfMLhgv8M9GqPiE0mgQfYzpVQ$

[Mon Apr 06 14:42:22 2020] [error] [client 128.210.56.177] 
"/home/httpd/perl/tmp/glhardin_purdue_1586198542_65331252_plot.data", line 13: 
expecting ':', referer: 
https://urldefense.com/v3/__https://loncapa.purdue.edu/priv/purdue/ecet_purdue/Topics/Power_Electronics/Thyristors/Calc_FiringAngle_using_Graphs_GeogebraInteractive_Multipart.problem__;!!HXCxUKc!gG78S6Qp2qDtQFc0NrfUKzJ4BmC7aOLMiBQ-9GfMLhgv8M9GqPiE0mgQfYzpVQ$

Do they make sense to you? Line 13 in the LON-CAPA code is part of a 
 statement, so I don't think that's the line the errors are 
referring to. I looked through the code again, and do not know where it might 
be expecting to see a ":" character, al

Re: [LON-CAPA-users] gnuplot problem

[Harding, Gene L]

Hi Stuart,

Wouldn't taking the absolute value of the expression inside the sqrt function 
also work? I tried this, thinking it would remove the negative number problem, 
but it did not work:
 $fnct_rms_halfwave="1/sqrt(pi) * sqrt( abs(1/2*(pi-x*pi/180) + 
1/4*sin(2*x*pi/180)) )";
I checked my gnuplot manual, and abs() appears to be the correct syntax for 
absolute value. Wouldn't that fix the negative number issue?


These are the lines IT sent me from the error log:
[Mon Apr 06 10:59:07 2020] [error] [client 128.210.56.177] 
"/home/httpd/perl/tmp/glhardin_purdue_1586185147_62400672_plot.data", line 13: 
expecting ':', referer: 
https://loncapa.purdue.edu/priv/purdue/ecet_purdue/Topics/Power_Electronics/Thyristors/Calc_FiringAngle_using_Graphs_GeogebraInteractive_Multipart.problem

[Mon Apr 06 11:17:06 2020] [error] [client 128.210.56.177] 
"/home/httpd/perl/tmp/glhardin_purdue_1586186225_6003521_plot.data", line 13: 
expecting ':', referer: 
https://loncapa.purdue.edu/priv/purdue/ecet_purdue/Topics/Power_Electronics/Thyristors/Calc_FiringAngle_using_Graphs_GeogebraInteractive_Multipart.problem

[Mon Apr 06 11:18:32 2020] [error] [client 128.210.56.177] 
"/home/httpd/perl/tmp/glhardin_purdue_1586186312_6039374_plot.data", line 13: 
expecting ':', referer: 
https://loncapa.purdue.edu/priv/purdue/ecet_purdue/Topics/Power_Electronics/Thyristors/Calc_FiringAngle_using_Graphs_GeogebraInteractive_Multipart.problem

[Mon Apr 06 14:42:22 2020] [error] [client 128.210.56.177] 
"/home/httpd/perl/tmp/glhardin_purdue_1586198542_65331252_plot.data", line 13: 
expecting ':', referer: 
https://loncapa.purdue.edu/priv/purdue/ecet_purdue/Topics/Power_Electronics/Thyristors/Calc_FiringAngle_using_Graphs_GeogebraInteractive_Multipart.problem

Do they make sense to you? Line 13 in the LON-CAPA code is part of a 
 statement, so I don't think that's the line the errors are 
referring to. I looked through the code again, and do not know where it might 
be expecting to see a ":" character, although I have done many versions of this 
during troubleshooting, and I wonder if this error came from a version when I 
was using the ternary operator to limit the plot interval.

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

-Original Message-
From: LON-CAPA-users  On Behalf Of 
raeb...@msu.edu
Sent: Tuesday, April 7, 2020 8:50 AM
To: Discussion list for LON-CAPA users 
Subject: Re: [LON-CAPA-users] gnuplot problem

Gene,

>
>  Two of them work fine, and the other two, which both have sine 
> expressions inside a sqrt function, do not.
>

My guess would be that gnuplot is encountering an issue because floating point 
arithmetic results in evaluation of the square root of a negative number (very 
close to zero), which should really be 0.

In that case an alternative would be to explicitly evaluate the components of 
the function within a perl script block in LON-CAPA, and test that they will 
not result in a negative number before applying LON-CAPA's sqrt() function to 
the result (rom which you would then add the value to an array (@Y) of y values 
for the plot).  The array (@X) will contain the corresponding x values, which 
you would have generating within the loop you use to generate the y values (in 
the @Y) array.

You would then replace use of the  tag with 
@X
@Y

where @X and @Y are arrays containing x and y values for the points on the plot.

See the: "Data Plot with Numerical Response" example in the problem templates.

Stuart Raeburn
LON-CAPA Academic Consortium
________
From: LON-CAPA-users  on behalf of 
Harding, Gene L 
Sent: Monday, April 6, 2020 7:35 PM
To: Discussion list for LON-CAPA users
Subject: Re: [LON-CAPA-users] gnuplot problem

Thanks Stuart. I do not have access to those directories (as far as I can 
tell), so have reached out to some IT folks to see if they can help me. I 
realized later that, apparently, "dynamically generated plot" is just the alt 
tag for the gnuplot.

I am baffled about what is going on. I have four functions for this problem. 
Two of them work fine, and the other two, which both have sine expressions 
inside a sqrt function, do not. I have tried using the ternary operator to zero 
out values outside of the axis limits. In all of the playing/troubleshooting I 
have done, it appears to not like the sqrt(bla bla sin(stuff)). I am not sure 
what version of gnuplot we are using.

I think I am just going to do the problem using Geogebra and forget about 
gnuplot, but it would be nice to know what's going on with the gnuplot. 
Hopefully, my IT guys can help...

BR,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://urldefense.com/v3/__https://polytechnic.purdue.edu/south-bend/__;!!HXCxUKc!jTjoyEwsimPmL2daj4jh1wXvO-ThMXDm58g_FiI6994pTe0-lVc

Re: [LON-CAPA-users] gnuplot problem

[Harding, Gene L]

Hi Grigory,

As part of the troubleshooting I have been doing, I used the ternary operator 
to set the value to zero outside of the display values:
   x<0 ? 0 : x<180 ? $fnct_rms_fullwave : 0
This did not help...
BR,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

-Original Message-
From: LON-CAPA-users  On Behalf Of 
SIMIN, GRIGORY
Sent: Monday, April 6, 2020 3:19 PM
To: Discussion list for LON-CAPA users 
Subject: Re: [LON-CAPA-users] gnuplot problem

Stuart,
For a GNU Function plot, is there a way to set the range of "x" or "t" 
arguments?
Thanks
Grigory

---
Grigory Simin, PhD,
Professor, 
Electrical Engineering Department
University of South Carolina
301 Main Street, Room 3A80
Swearingen Engineering Center
Columbia, SC  29208



-Original Message-
From: LON-CAPA-users [mailto:lon-capa-users-boun...@mail.lon-capa.org] On 
Behalf Of Raeburn, Stuart
Sent: Monday, April 6, 2020 15:11
To: Discussion list for LON-CAPA users 
Subject: Re: [LON-CAPA-users] gnuplot problem

Hello Gene,

If the text: "dynamically generated plot" is displayed instead of an image, 
when using gnuplot, then it means gnuplot was unable to process the data file 
generated by LON-CAPA for your plot.

That data file will have been written to /home/httpd/perl/tmp/ on your server's 
filesystem with a file name that includes your username, and ends _plot.data. 
and there will also be an error message in the web server's error log file, 
e.g., /var/log/httpd/ssl_error_log, with your problem listed as the referer.  
(You'd need to ask your system administrator to look in the log files).

I was able to successfully generate plots for both functions:
$fnct_rms_halfwave="1/$pi * (1/2*($pi-x) + 1/4*sin(2*x))";
$fnct_rms_fullwave="(2/$pi) * (1/2*($pi-x) + 1/4*sin(2*x))";

in a problem in my Authoring Space (gnuplot version: 4.4.2).

You might double check that there is not a typo in the problem XML, where you 
refer to the function, e.g., $fnct_rms_halfwave

Otherwise, there could be an issue with other attributes defined for the plot, 
aside from the functions themselves (although in most cases, LON-CAPA replaces 
invalid values with valid ones, before creating the _plot.data file passed to 
gnuplot).

Stuart Raeburn
LON-CAPA Academic Consortium
________
From: LON-CAPA-users  on behalf of 
Harding, Gene L 
Sent: Monday, April 6, 2020 11:22 AM
To: Discussion list for LON-CAPA users
Subject: [LON-CAPA-users] gnuplot problem

Hi everyone,

I am having trouble generating a gnuplot using the following two functions in 
LON-CAPA:
   $fnct_rms_halfwave="1/$pi * (1/2*($pi-x) + 1/4*sin(2*x))";
   $fnct_rms_fullwave="(2/$pi) * (1/2*($pi-x) + 1/4*sin(2*x))";

Instead of rendering a plot, LON-CAPA just displays a message that says 
"dynamically generated plot". It plots fine in Geogebra. Does anyone know 
what's going on with the gnuplot?

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

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[LON-CAPA-users] gnuplot problem

[Harding, Gene L]

Hi everyone,

I am having trouble generating a gnuplot using the following two functions in 
LON-CAPA:
   $fnct_rms_halfwave="1/$pi * (1/2*($pi-x) + 1/4*sin(2*x))";
   $fnct_rms_fullwave="(2/$pi) * (1/2*($pi-x) + 1/4*sin(2*x))";

Instead of rendering a plot, LON-CAPA just displays a message that says 
"dynamically generated plot". It plots fine in Geogebra. Does anyone know 
what's going on with the gnuplot?

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

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Re: [LON-CAPA-users] Math Display Problem

[Harding, Gene L]

Ah, I see. That worked, so I added it to my ever-growing notes file. :)
Thanks Mark!

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

-Original Message-
From: LON-CAPA-users  On Behalf Of 
Lucas, Mark
Sent: Sunday, March 29, 2020 10:50 PM
To: Discussion list for LON-CAPA users 
Subject: Re: [LON-CAPA-users] Math Display Problem

The \ in $PwrIntegral need to be escaped.

Try:
$PwrIntegral = "p(x) = \\frac{1}{T} \\int_0^T v(x) i(x) dx”;

\\ escapes the left slash and puts a single left slash in.

\ is used to include special characters in a perl string: \n - newline, \r - 
carriage return.
It thought \f and \i were special characters.
\\ says make this a real \

Hope this helps!
Mark

> On Mar 29, 2020, at 10:25 PM, Harding, Gene L  wrote:
> 
> Hi,
>  
> I am having trouble getting equations to render properly. I have done this 
> before, and have even tried directly copying code I have used before, but 
> cannot get it to display properly.
>  
> This is one of the equation definitions:
>   $PwrIntegral = "p(x) = \frac{1}{T} \int_0^T v(x) i(x) dx";
>  
> This is the radiobuttonresponse code using it:
> 
> 
> 
> 
> $ $PwrIntegral $
> 
> 
> 
> $ $RMSIntegral 
> $
> 
> 
> $ $AvgIntegral 
> $
> 
> 
> bla
> 
> 
> This is foil Five, and it is currently set to 
> "false."
> 
> 
> 
>  
> I can’t send a snip of the display to the listserv, but it looks something 
> like this:
> p(x) = rac1Tint0Tv(x)i(x)dx
>  
> It responds to the _subscript and ^superscript, but completely ignores the 
> \frac and \int commands. I know I must be doing something dumb, but don’t 
> know what, and don’t understand why a different expression I pulled from a 
> correctly working problem does not work in this one.
>  
> If anyone can see what I’m doing wrong, please help. The exam is scheduled 
> for first thing Tuesday morning…
>  
> Best regards,
>  
> Gene L. Harding, PE
> Associate Professor of ECET
> Purdue University
> 574-520-4190
> https://polytechnic.purdue.edu/south-bend/
>  
> ___
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-- 
Mark Lucas  email: 
luc...@ohio.edu
252D Clippinger Lab phone: 
(740)597-2984
Department of Physics and Astronomy fax: (740)593-0433
Ohio University
Athens, OH 45701

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Re: [LON-CAPA-users] Custom Response Question

[Harding, Gene L]

Had another duh moment, figure it out, and finished the problem. Apologize for 
spamming the listserv.
Best regards,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/


-Original Message-
From: Harding, Gene L 
Sent: Thursday, March 26, 2020 3:14 PM
To: Discussion list for LON-CAPA users 
Subject: RE: [LON-CAPA-users] Custom Response Question

That worked. But now, when the problem is processed as correct, it displays 
blanks instead of the correct values in the matrix. Is there a way to get it to 
display the correct values? I know how to also test the conditions for correct 
answer or maxtries exceeded, but how do I display the matrix element values 
instead of blanks...?

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/


-Original Message-
From: LON-CAPA-users  On Behalf Of 
Harding, Gene L
Sent: Thursday, March 26, 2020 2:53 PM
To: Discussion list for LON-CAPA users 
Subject: Re: [LON-CAPA-users] Custom Response Question

Ooooh. I just remembered that I must use eq, not == when evaluating strings. 
I'm redoing that portion right now, and it seems to be working.

I am, however, open to ideas how to do it better, if anyone wants to offer them.

BR,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/


-Original Message-
From: LON-CAPA-users  On Behalf Of 
Harding, Gene L
Sent: Thursday, March 26, 2020 2:41 PM
To: Discussion list for LON-CAPA users 
Subject: Re: [LON-CAPA-users] Custom Response Question

Hi Mark,

Sure. The problem requires students to "write" a matrix equation. I was going 
to include a snip of the displayed XML, but this email format will not allow me 
to paste a figure.

This is the perl script:
 
 $total_score = 0;
 # These submission variables appear to be local to this perl script 
section only.
 ($ZR11,$ZX11,$ZR12,$ZX12,$ZR13,$ZX13,$I11,$E11mag,$E11ph,
  $ZR21,$ZX21,$ZR22,$ZX22,$ZR23,$ZX23,$I21,$E21mag,$E21ph,
  $ZR31,$ZX31,$ZR32,$ZX32,$ZR33,$ZX33,$I31,$E31mag,$E31ph) = 
@$submission;

   # In these if stmts, conditionals cannot distinguish between 0 and null, 
   # and counts null or any string as correct for "I1", "I2", or "I3"
if ($ZR11==$R1  && $ZX11==-$X_C1)   {$total_score = 1/15;}
if ($ZR12==-$R1 && $ZX12=="0")  {$total_score = 
$total_score + 1/15;} 
if ($ZR13=="0"  && $ZX13=="0")  {$total_score = 
$total_score + 1/15;}
if ($ZR21==-$R1 && $ZX21==0){$total_score = 
$total_score + 1/15;}
if ($ZR22==$R1  && $ZX22==$X_L1-$X_C2)  {$total_score = 
$total_score + 1/15;}
if ($ZR23==0&& $ZX23==$X_C2){$total_score = 
$total_score + 1/15;}
if ($ZR31==0&& $ZX31==0){$total_score = 
$total_score + 1/15;}
if ($ZR32==0&& $ZX32==$X_C2){$total_score = 
$total_score + 1/15;}
if ($ZR33==$R2  && $ZX33==-$X_C2-$X_C3) {$total_score = 
$total_score + 1/15;}
if ($I11=="I1") {$total_score = 
$total_score + 1/15;}
if ($I21=="I2") {$total_score = 
$total_score + 1/15;}
if ($I31=="I3") {$total_score = 
$total_score + 1/15;}
if ($E11mag==$E1mag && $E11ph==$E1ph)   {$total_score = 
$total_score + 1/15;}
if ($E21mag==$E2mag && $E21ph==$E2ph)   {$total_score = 
$total_score + 1/15;}
if ($E31mag==0  && $E31ph==0)   {$total_score = 
$total_score + 1/15;}

return ('ASSIGNED_SCORE',$total_score); 


The equation is a 3x3 impedance (Z) matrix multiplied by a 3-element current 
column vector to get a 3-element voltage column vector. The Z matrix elements 
are complex values in rectangular form, but the real and imaginary parts are 
processed separately as real integers. That part works fine. The problem is 
that nothing needs to be entered at all for the zero values; no entry is still 
evaluated as correct. As you can see above, I have tried processing them as 
both numeric (0) and text ("0") but neither approach works.

The intent of the current column vector elements (the variables in this 
equation) is for students to enter the variables as text values: I1, I2, and I3.

The voltage column vector elements are complex values in polar form, magnitude 
in V and phase in degrees. Both values are processed as real numbers.

The XML displays appropriate units by each element of the Z matrix and V column 
vector, so no units processing is needed.

The order of the variables in the submissio

Re: [LON-CAPA-users] Custom Response Question

[Harding, Gene L]

That worked. But now, when the problem is processed as correct, it displays 
blanks instead of the correct values in the matrix. Is there a way to get it to 
display the correct values? I know how to also test the conditions for correct 
answer or maxtries exceeded, but how do I display the matrix element values 
instead of blanks...?

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/


-Original Message-
From: LON-CAPA-users  On Behalf Of 
Harding, Gene L
Sent: Thursday, March 26, 2020 2:53 PM
To: Discussion list for LON-CAPA users 
Subject: Re: [LON-CAPA-users] Custom Response Question

Ooooh. I just remembered that I must use eq, not == when evaluating strings. 
I'm redoing that portion right now, and it seems to be working.

I am, however, open to ideas how to do it better, if anyone wants to offer them.

BR,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/


-Original Message-
From: LON-CAPA-users  On Behalf Of 
Harding, Gene L
Sent: Thursday, March 26, 2020 2:41 PM
To: Discussion list for LON-CAPA users 
Subject: Re: [LON-CAPA-users] Custom Response Question

Hi Mark,

Sure. The problem requires students to "write" a matrix equation. I was going 
to include a snip of the displayed XML, but this email format will not allow me 
to paste a figure.

This is the perl script:
 
 $total_score = 0;
 # These submission variables appear to be local to this perl script 
section only.
 ($ZR11,$ZX11,$ZR12,$ZX12,$ZR13,$ZX13,$I11,$E11mag,$E11ph,
  $ZR21,$ZX21,$ZR22,$ZX22,$ZR23,$ZX23,$I21,$E21mag,$E21ph,
  $ZR31,$ZX31,$ZR32,$ZX32,$ZR33,$ZX33,$I31,$E31mag,$E31ph) = 
@$submission;

   # In these if stmts, conditionals cannot distinguish between 0 and null, 
   # and counts null or any string as correct for "I1", "I2", or "I3"
if ($ZR11==$R1  && $ZX11==-$X_C1)   {$total_score = 1/15;}
if ($ZR12==-$R1 && $ZX12=="0")  {$total_score = 
$total_score + 1/15;} 
if ($ZR13=="0"  && $ZX13=="0")  {$total_score = 
$total_score + 1/15;}
if ($ZR21==-$R1 && $ZX21==0){$total_score = 
$total_score + 1/15;}
if ($ZR22==$R1  && $ZX22==$X_L1-$X_C2)  {$total_score = 
$total_score + 1/15;}
if ($ZR23==0&& $ZX23==$X_C2){$total_score = 
$total_score + 1/15;}
if ($ZR31==0&& $ZX31==0){$total_score = 
$total_score + 1/15;}
if ($ZR32==0&& $ZX32==$X_C2){$total_score = 
$total_score + 1/15;}
if ($ZR33==$R2  && $ZX33==-$X_C2-$X_C3) {$total_score = 
$total_score + 1/15;}
if ($I11=="I1") {$total_score = 
$total_score + 1/15;}
if ($I21=="I2") {$total_score = 
$total_score + 1/15;}
if ($I31=="I3") {$total_score = 
$total_score + 1/15;}
if ($E11mag==$E1mag && $E11ph==$E1ph)   {$total_score = 
$total_score + 1/15;}
if ($E21mag==$E2mag && $E21ph==$E2ph)   {$total_score = 
$total_score + 1/15;}
if ($E31mag==0  && $E31ph==0)   {$total_score = 
$total_score + 1/15;}

return ('ASSIGNED_SCORE',$total_score); 


The equation is a 3x3 impedance (Z) matrix multiplied by a 3-element current 
column vector to get a 3-element voltage column vector. The Z matrix elements 
are complex values in rectangular form, but the real and imaginary parts are 
processed separately as real integers. That part works fine. The problem is 
that nothing needs to be entered at all for the zero values; no entry is still 
evaluated as correct. As you can see above, I have tried processing them as 
both numeric (0) and text ("0") but neither approach works.

The intent of the current column vector elements (the variables in this 
equation) is for students to enter the variables as text values: I1, I2, and I3.

The voltage column vector elements are complex values in polar form, magnitude 
in V and phase in degrees. Both values are processed as real numbers.

The XML displays appropriate units by each element of the Z matrix and V column 
vector, so no units processing is needed.

The order of the variables in the submission input/assignment statement is 
dictated by the XML display of the matrix. The other variables, like $R1, 
$X_C2, $E2ph, etc., are given variables from the perl script at the beginning 
of the problem.

BR,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

-Original Message-
From: LON-CAPA-users  On Behalf Of 
Lucas, Mark
Sent: Thursday, March 26,

Re: [LON-CAPA-users] Custom Response Question

[Harding, Gene L]

Ooooh. I just remembered that I must use eq, not == when evaluating strings. 
I'm redoing that portion right now, and it seems to be working.

I am, however, open to ideas how to do it better, if anyone wants to offer them.

BR,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/


-Original Message-
From: LON-CAPA-users  On Behalf Of 
Harding, Gene L
Sent: Thursday, March 26, 2020 2:41 PM
To: Discussion list for LON-CAPA users 
Subject: Re: [LON-CAPA-users] Custom Response Question

Hi Mark,

Sure. The problem requires students to "write" a matrix equation. I was going 
to include a snip of the displayed XML, but this email format will not allow me 
to paste a figure.

This is the perl script:
 
 $total_score = 0;
 # These submission variables appear to be local to this perl script 
section only.
 ($ZR11,$ZX11,$ZR12,$ZX12,$ZR13,$ZX13,$I11,$E11mag,$E11ph,
  $ZR21,$ZX21,$ZR22,$ZX22,$ZR23,$ZX23,$I21,$E21mag,$E21ph,
  $ZR31,$ZX31,$ZR32,$ZX32,$ZR33,$ZX33,$I31,$E31mag,$E31ph) = 
@$submission;

   # In these if stmts, conditionals cannot distinguish between 0 and null, 
   # and counts null or any string as correct for "I1", "I2", or "I3"
if ($ZR11==$R1  && $ZX11==-$X_C1)   {$total_score = 1/15;}
if ($ZR12==-$R1 && $ZX12=="0")  {$total_score = 
$total_score + 1/15;} 
if ($ZR13=="0"  && $ZX13=="0")  {$total_score = 
$total_score + 1/15;}
if ($ZR21==-$R1 && $ZX21==0){$total_score = 
$total_score + 1/15;}
if ($ZR22==$R1  && $ZX22==$X_L1-$X_C2)  {$total_score = 
$total_score + 1/15;}
if ($ZR23==0&& $ZX23==$X_C2){$total_score = 
$total_score + 1/15;}
if ($ZR31==0&& $ZX31==0){$total_score = 
$total_score + 1/15;}
if ($ZR32==0&& $ZX32==$X_C2){$total_score = 
$total_score + 1/15;}
if ($ZR33==$R2  && $ZX33==-$X_C2-$X_C3) {$total_score = 
$total_score + 1/15;}
if ($I11=="I1") {$total_score = 
$total_score + 1/15;}
if ($I21=="I2") {$total_score = 
$total_score + 1/15;}
if ($I31=="I3") {$total_score = 
$total_score + 1/15;}
if ($E11mag==$E1mag && $E11ph==$E1ph)   {$total_score = 
$total_score + 1/15;}
if ($E21mag==$E2mag && $E21ph==$E2ph)   {$total_score = 
$total_score + 1/15;}
if ($E31mag==0  && $E31ph==0)   {$total_score = 
$total_score + 1/15;}

return ('ASSIGNED_SCORE',$total_score); 


The equation is a 3x3 impedance (Z) matrix multiplied by a 3-element current 
column vector to get a 3-element voltage column vector. The Z matrix elements 
are complex values in rectangular form, but the real and imaginary parts are 
processed separately as real integers. That part works fine. The problem is 
that nothing needs to be entered at all for the zero values; no entry is still 
evaluated as correct. As you can see above, I have tried processing them as 
both numeric (0) and text ("0") but neither approach works.

The intent of the current column vector elements (the variables in this 
equation) is for students to enter the variables as text values: I1, I2, and I3.

The voltage column vector elements are complex values in polar form, magnitude 
in V and phase in degrees. Both values are processed as real numbers.

The XML displays appropriate units by each element of the Z matrix and V column 
vector, so no units processing is needed.

The order of the variables in the submission input/assignment statement is 
dictated by the XML display of the matrix. The other variables, like $R1, 
$X_C2, $E2ph, etc., are given variables from the perl script at the beginning 
of the problem.

BR,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

-Original Message-
From: LON-CAPA-users  On Behalf Of 
Lucas, Mark
Sent: Thursday, March 26, 2020 2:18 PM
To: Discussion list for LON-CAPA users 
Subject: Re: [LON-CAPA-users] Custom Response Question

Gene,

Could you post sample variables and perhaps an example of the perl you are 
trying to use?
What does the array look like? What are some typical variables? (or at least 
analogs if you don’t want to give away content).

Mark

> On Mar 26, 2020, at 2:14 PM, Harding, Gene L  wrote:
> 
> Hi,
>  
> I am trying to do something with a customresponse part that I cannot do 
> really cleanly with normal response types, but am having some trouble 
> evaluating the inputs. The inputs include numeric and text values as part of 
> a single ar

Re: [LON-CAPA-users] Custom Response Question

[Harding, Gene L]

Hi Mark,

Sure. The problem requires students to "write" a matrix equation. I was going 
to include a snip of the displayed XML, but this email format will not allow me 
to paste a figure.

This is the perl script:
 
 $total_score = 0;
 # These submission variables appear to be local to this perl script 
section only.
 ($ZR11,$ZX11,$ZR12,$ZX12,$ZR13,$ZX13,$I11,$E11mag,$E11ph,
  $ZR21,$ZX21,$ZR22,$ZX22,$ZR23,$ZX23,$I21,$E21mag,$E21ph,
  $ZR31,$ZX31,$ZR32,$ZX32,$ZR33,$ZX33,$I31,$E31mag,$E31ph) = 
@$submission;

   # In these if stmts, conditionals cannot distinguish between 0 and null, 
   # and counts null or any string as correct for "I1", "I2", or "I3"
if ($ZR11==$R1  && $ZX11==-$X_C1)   {$total_score = 1/15;}
if ($ZR12==-$R1 && $ZX12=="0")  {$total_score = 
$total_score + 1/15;} 
if ($ZR13=="0"  && $ZX13=="0")  {$total_score = 
$total_score + 1/15;}
if ($ZR21==-$R1 && $ZX21==0){$total_score = 
$total_score + 1/15;}
if ($ZR22==$R1  && $ZX22==$X_L1-$X_C2)  {$total_score = 
$total_score + 1/15;}
if ($ZR23==0&& $ZX23==$X_C2){$total_score = 
$total_score + 1/15;}
if ($ZR31==0&& $ZX31==0){$total_score = 
$total_score + 1/15;}
if ($ZR32==0&& $ZX32==$X_C2){$total_score = 
$total_score + 1/15;}
if ($ZR33==$R2  && $ZX33==-$X_C2-$X_C3) {$total_score = 
$total_score + 1/15;}
if ($I11=="I1") {$total_score = 
$total_score + 1/15;}
if ($I21=="I2") {$total_score = 
$total_score + 1/15;}
if ($I31=="I3") {$total_score = 
$total_score + 1/15;}
if ($E11mag==$E1mag && $E11ph==$E1ph)   {$total_score = 
$total_score + 1/15;}
if ($E21mag==$E2mag && $E21ph==$E2ph)   {$total_score = 
$total_score + 1/15;}
if ($E31mag==0  && $E31ph==0)   {$total_score = 
$total_score + 1/15;}

return ('ASSIGNED_SCORE',$total_score); 


The equation is a 3x3 impedance (Z) matrix multiplied by a 3-element current 
column vector to get a 3-element voltage column vector. The Z matrix elements 
are complex values in rectangular form, but the real and imaginary parts are 
processed separately as real integers. That part works fine. The problem is 
that nothing needs to be entered at all for the zero values; no entry is still 
evaluated as correct. As you can see above, I have tried processing them as 
both numeric (0) and text ("0") but neither approach works.

The intent of the current column vector elements (the variables in this 
equation) is for students to enter the variables as text values: I1, I2, and I3.

The voltage column vector elements are complex values in polar form, magnitude 
in V and phase in degrees. Both values are processed as real numbers.

The XML displays appropriate units by each element of the Z matrix and V column 
vector, so no units processing is needed.

The order of the variables in the submission input/assignment statement is 
dictated by the XML display of the matrix. The other variables, like $R1, 
$X_C2, $E2ph, etc., are given variables from the perl script at the beginning 
of the problem.

BR,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

-Original Message-
From: LON-CAPA-users  On Behalf Of 
Lucas, Mark
Sent: Thursday, March 26, 2020 2:18 PM
To: Discussion list for LON-CAPA users 
Subject: Re: [LON-CAPA-users] Custom Response Question

Gene,

Could you post sample variables and perhaps an example of the perl you are 
trying to use?
What does the array look like? What are some typical variables? (or at least 
analogs if you don’t want to give away content).

Mark

> On Mar 26, 2020, at 2:14 PM, Harding, Gene L  wrote:
> 
> Hi,
>  
> I am trying to do something with a customresponse part that I cannot do 
> really cleanly with normal response types, but am having some trouble 
> evaluating the inputs. The inputs include numeric and text values as part of 
> a single array input. I am having to problems:
> 1.   I have not been able to figure out a way, in the “if” statements, to 
> distinguish between a zero (0) answer and a null (“”) answer.
> 2.   The string components evaluate to true for any text value. Only 
> numeric entries evaluate as false.
>  
> My questions:
> 1.   Is there a way to distinguish between a 0 and a null (i.e., no) 
> response?
> 2.   Is it possible to input both numeric and string values in separate 
> textline inputs within one customresponse section?
> 

[LON-CAPA-users] Custom Response Question

[Harding, Gene L]

Hi,

I am trying to do something with a customresponse part that I cannot do really 
cleanly with normal response types, but am having some trouble evaluating the 
inputs. The inputs include numeric and text values as part of a single array 
input. I am having to problems:

1.   I have not been able to figure out a way, in the "if" statements, to 
distinguish between a zero (0) answer and a null ("") answer.

2.   The string components evaluate to true for any text value. Only 
numeric entries evaluate as false.

My questions:

1.   Is there a way to distinguish between a 0 and a null (i.e., no) 
response?

2.   Is it possible to input both numeric and string values in separate 
textline inputs within one customresponse section?

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

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Re: [LON-CAPA-users] Piecewise Linear Functions

[Harding, Gene L]

Thanks Justin! (Sorry for the slow reply; stuck in the lab for a few hours this 
afternoon/evening.)

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

From: LON-CAPA-users  On Behalf Of 
Justin Gray
Sent: Saturday, March 21, 2020 3:34 PM
To: Discussion list for LON-CAPA users 
Subject: Re: [LON-CAPA-users] Piecewise Linear Functions

Hi Gene,

To answer your first question, here is a sample piecewise-defined function in 
Gnuplots:




x < 0 ? -x : x**2



Best,
Justin

--

Justin Gray
Senior Lecturer | Department of Mathematics
Simon Fraser University | SCK 10531
 University Dr., Burnaby, B.C. V5A 1S6
Canada
T: 778.782.4237

Simon Fraser University is located on the Unceded Coast Salish Territories of 
the xʷməθkʷəy̓əm (Musqueam), Səl̓ílwətaʔ/Selilwitulh (Tsleil-Waututh), 
Kwikwitlem, and Skwxwú7mesh Úxwumixw (Squamish) Peoples


On Sat, Mar 21, 2020 at 11:36 AM Harding, Gene L 
mailto:glhar...@purdue.edu>> wrote:
Hi,

Does anyone know how to define a piecewise linear function in LON-CAPA, and 
plot it with gnuplot? And, a related question: How  do you put plots next to 
each other?

I need to display a plot of voltage on one graph, with a plot of 
phase-angle-fired half-sine current right below it on a separate graph, but 
using the same horizontal axis values and scale. The multiplot command in 
gnuplot allows multiple plots next to each other, similar to MATLAB, and the 
ternary operator allows definition of piecewise linear functions, but I don’t 
know how to implement either of them from within LON-CAPA.

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

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[LON-CAPA-users] Piecewise Linear Functions

[Harding, Gene L]

Hi,

Does anyone know how to define a piecewise linear function in LON-CAPA, and 
plot it with gnuplot? And, a related question: How  do you put plots next to 
each other?

I need to display a plot of voltage on one graph, with a plot of 
phase-angle-fired half-sine current right below it on a separate graph, but 
using the same horizontal axis values and scale. The multiplot command in 
gnuplot allows multiple plots next to each other, similar to MATLAB, and the 
ternary operator allows definition of piecewise linear functions, but I don't 
know how to implement either of them from within LON-CAPA.

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

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Re: [LON-CAPA-users] Conditional Blocks

[Harding, Gene L]

Thanks Doug! The syntax you sent, combined with code I wrote for a different 
problem, allowed me to get something workable, although I still have two issues 
to sort out:

1.   How do I get the score for a problem part? I assume it’s 
_data(“partscore”,”partid”); where partscore is the name of a variable 
holding the score for partid, but I do not know the variable name.

2.   When I turn on lenient grading, it does not allow multiple attempts, 
even if tries < maxtries. Is that normal?

By the way, is there documentation somewhere with a list of parameters, like 
maxtries, and data variables, like tries? I think I could figure my way through 
this without bugging the listserv if I had such a document…

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

From: LON-CAPA-users  On Behalf Of 
Mills, Douglas G
Sent: Monday, March 16, 2020 11:39 PM
To: Discussion list for LON-CAPA users 
Subject: Re: [LON-CAPA-users] Conditional Blocks

Hi Gene,

The code I pulled from a quiz I coded and may perhaps give you the right idea:



In your case you will probably want to make the condition either than question 
1 has been answered correctly or that all the tried have been used.   I can 
track specifics down for that if needed but perhaps the example is enough to 
get you on the right track?

Doug

-sent from mobile-


On Mar 16, 2020, at 6:28 PM, Harding, Gene L 
mailto:glhar...@purdue.edu>> wrote:

Hi,

I am working on a problem for an upcoming exam. In the past I have just done it 
via paper exam, which was fine until now. (I did plan to do it in LON-CAPA 
someday, but thanks to Corona, someday is now here.)

The problem starts with an optionresponse. After the student answers it, I want 
to show a radiobuttonresponse problem, then show a figure and a matrix equation 
containing 15 parts. In the past I have used the “display-one-part-at-a-time” 
feature, but the catch is that the matrix equation has 15 parts in it, and I 
need to show the figure and all 15 parts of the matrix equation at the same 
time, right after the radio button problem.

I suspect I can do it with a  tag, but am having trouble finding 
examples of conditional expressions and variables that I can use inside the 
 code. Does anyone know of a good resource for that info, or know the 
parameters and syntax I need to use? I have explored the authoring guide and 
LON-CAPA online help, done web searches, and looked through YouTube, all to no 
avail…

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

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[LON-CAPA-users] Conditional Blocks

[Harding, Gene L]

Hi,

I am working on a problem for an upcoming exam. In the past I have just done it 
via paper exam, which was fine until now. (I did plan to do it in LON-CAPA 
someday, but thanks to Corona, someday is now here.)

The problem starts with an optionresponse. After the student answers it, I want 
to show a radiobuttonresponse problem, then show a figure and a matrix equation 
containing 15 parts. In the past I have used the "display-one-part-at-a-time" 
feature, but the catch is that the matrix equation has 15 parts in it, and I 
need to show the figure and all 15 parts of the matrix equation at the same 
time, right after the radio button problem.

I suspect I can do it with a  tag, but am having trouble finding 
examples of conditional expressions and variables that I can use inside the 
 code. Does anyone know of a good resource for that info, or know the 
parameters and syntax I need to use? I have explored the authoring guide and 
LON-CAPA online help, done web searches, and looked through YouTube, all to no 
avail...

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

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Re: [LON-CAPA-users] Quick Question

[Harding, Gene L]

Hi Mark,

In the customresponse section, the array created matches the size of the 
submission. It's the Perl script I was wondering about. The number of variables 
defined in the Perl script to capture the submission will ultimately be 76, but 
the actual number of submission elements will vary from 20 to 76, depending on 
the randomization. The predefined variables to capture the submission elements 
will usually "outnumber" the actual submission elements. 

In my experience so far, those extra variables do not get used/initialized. 
When I try to display them in the problem statement (for debugging purposes) 
they do not have values, just show up as literals, e.g., "$A2plus_tailx" 
instead of some numeric value. Does that make sense?

BR,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

-Original Message-
From: LON-CAPA-users  On Behalf Of 
Lucas, Mark
Sent: Wednesday, March 4, 2020 8:57 AM
To: Discussion list for LON-CAPA users 
Subject: Re: [LON-CAPA-users] Quick Question

My gut says that is not a problem. Since you are grading it in the 
customresponse, you just ignore those parts of the array if they do contain 
useful information.
They will be saved as part of the “submission” record for the student, but that 
shouldn’t be a problem.

Mark


> On Mar 4, 2020, at 8:44 AM, Harding, Gene L  wrote:
> 
> Hi,
>  
> I have a question about accessing submissions using the () 
> function.
>  
> I am working on a problem interfacing with Geogebra that will have a variable 
> number of submission inputs, depending on the randomization of the problem. 
> The code in the customresponse section is relatively short and 
> straightforward, so I just used an array to load the values. Someone at last 
> year’s conference suggested this approach, and it works well, creating an 
> array of the appropriate size for the submission:
> 
>  
> The code in the primary block of Perl script, however, is more complicated, 
> so I have been using discrete variables with names that make it easier to 
> read, follow, and troubleshoot the code:
> 
> I have found that I can include the unused variables, which in the above case 
> are all of the variables beginning with $A2, and LON-CAPA just ignores those 
> variables with no apparent ill effects. Is that a reasonable and “safe” way 
> to write the code, or I am asking for trouble using this approach?
>  
> Best regards,
>  
> Gene L. Harding, PE
> Associate Professor of ECET
> Purdue University
> 574-520-4190
> https://polytechnic.purdue.edu/south-bend/
>  
> ___
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> lon-capa.org%2Fmailman%2Flistinfo%2Flon-capa-usersdata=02%7C01%7C
> lucasm%40ohio.edu%7C269ca88417f8491a9cf108d7c042612a%7Cf3308007477c4a7
> 0888934611817c55a%7C0%7C0%7C637189263646163217sdata=FbYNztkeBq0Q0
> Cfz%2BU4pX7xL74HzWKpwcuuLKuQO4jg%3Dreserved=0

-- 
Mark Lucas  email: 
luc...@ohio.edu
252D Clippinger Lab phone: 
(740)597-2984
Department of Physics and Astronomy fax: (740)593-0433
Ohio University
Athens, OH 45701

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[LON-CAPA-users] Quick Question

[Harding, Gene L]

Hi,

I have a question about accessing submissions using the () function.

I am working on a problem interfacing with Geogebra that will have a variable 
number of submission inputs, depending on the randomization of the problem. The 
code in the customresponse section is relatively short and straightforward, so 
I just used an array to load the values. Someone at last year's conference 
suggested this approach, and it works well, creating an array of the 
appropriate size for the submission:
[cid:image002.jpg@01D5F201.23A73F30]

The code in the primary block of Perl script, however, is more complicated, so 
I have been using discrete variables with names that make it easier to read, 
follow, and troubleshoot the code:
[cid:image006.jpg@01D5F201.23A73F30]
I have found that I can include the unused variables, which in the above case 
are all of the variables beginning with $A2, and LON-CAPA just ignores those 
variables with no apparent ill effects. Is that a reasonable and "safe" way to 
write the code, or I am asking for trouble using this approach?

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

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[LON-CAPA-users] Error with

[Harding, Gene L]

Hi,

As long as I have been coding multi-part problems I have run into this issue, 
but it seems random. I am using  to display the ID of the current 
part:


 If using impedance combination, what is the appropriate way 
to begin analyzing this circuit?


In some problems it works fine, displaying what in this case should be an "a". 
In some problems, however, I get an output of an odd character followed by 
"tpart":
[cid:image001.jpg@01D5ECB2.18834E90]

Does anyone know what causes this?

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

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Re: [LON-CAPA-users] Hyperbolic Trig Function Problem

[Harding, Gene L]

Thanks Justin, that was a good idea. I tried it, but got the same results; also 
double-checked MATLAB’s result with Google. I was typing a longer response when 
I saw Stuart’s solution, but still want to say thank you. I had not thought of 
trying Maxima.

Stuart, thank you. You never cease to amaze me. I will make a note of that 
function call syntax for future reference.

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

From: LON-CAPA-users  On Behalf Of 
Justin Gray
Sent: Wednesday, January 29, 2020 7:39 PM
To: Discussion list for LON-CAPA users 
Subject: Re: [LON-CAPA-users] Hyperbolic Trig Function Problem

Have you considered tried calling on tanh(x) in Maxima using ('maxima',   ) 
instead of using (x)?

Justin

--

Justin Gray
Senior Lecturer | Department of Mathematics
Simon Fraser University | SCK 10531
 University Dr., Burnaby, B.C. V5A 1S6
T: 778.782.4237

Simon Fraser University is located on the Unceded Coast Salish Territories of 
the xʷməθkʷəy̓əm (Musqueam), Səl̓ílwətaʔ/Selilwitulh (Tsleil-Waututh), 
Kwikwitlem, and Skwxwú7mesh Úxwumixw (Squamish) Peoples


On Wed, Jan 29, 2020 at 3:43 PM Harding, Gene L 
mailto:glhar...@purdue.edu>> wrote:
Hi,

Does anyone have experience using the hyperbolic trig functions in LON-CAPA? I 
have recently been coding some new problems that use the () function. I 
was comparing the results to those I got using MATLAB, and after some 
troubleshooting it appears that the difference is the tanh. Specifically, the 
($x) function in LON-CAPA always returns an imaginary value of zero.

Here is the code:
$tanh   = ($gamma*$len);
$tanh_real  = Re($tanh);
$tanh_imag= Im($tanh);
where $gamma is a complex number and $len is a scalar. MATLAB computes a 
complex number for tanh in the examples I have tried. Am I doing something 
wrong? Does LC not compute tanh correctly?

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190

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[LON-CAPA-users] Hyperbolic Trig Function Problem

[Harding, Gene L]

Hi,

Does anyone have experience using the hyperbolic trig functions in LON-CAPA? I 
have recently been coding some new problems that use the () function. I 
was comparing the results to those I got using MATLAB, and after some 
troubleshooting it appears that the difference is the tanh. Specifically, the 
($x) function in LON-CAPA always returns an imaginary value of zero.

Here is the code:
$tanh   = ($gamma*$len);
$tanh_real  = Re($tanh);
$tanh_imag= Im($tanh);
where $gamma is a complex number and $len is a scalar. MATLAB computes a 
complex number for tanh in the examples I have tried. Am I doing something 
wrong? Does LC not compute tanh correctly?

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190

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[LON-CAPA-users] FW: Rounding Issue

[Harding, Gene L]

Hi everyone,

I have a quiz problem in LC that seems to be doing some odd things with the 
rounding. I have successfully recreated the problem reported by one of my 
students, but cannot figure out why it happens.

The answer to the problem (part c) is 2.65 on the dot. The problem requests an 
answer with one place after the decimal, and the tolerance is +/- 0.05. In this 
case, since the value computes to exactly 2.65, LC should take anything from 
2.6 to 2.7. In fact, in author view LC indicates it will take anything from 2.6 
to 2.7:
[cid:image002.jpg@01D570BD.B3DBBD30]

The trouble is that 2.6 works, 2.65 works, but 2.7 does not.

This is the Perl script calculation (Rf=33, Ri=20):
$Av = 1+$Rf/$Ri;   # Gain

This is the response code:





Any idea what the problem is? I am baffled.

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

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Re: [LON-CAPA-users] Video Viewing Problem

[Harding, Gene L]

Hi Stuart,

It is an mp4 file in 
https://loncapa.purdue.edu/res/purdue/ecet_purdue/Topics/Videos/. 

BR,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/


-Original Message-
From: LON-CAPA-users  On Behalf Of 
Raeburn, Stuart
Sent: Wednesday, August 28, 2019 5:23 PM
To: Discussion list for LON-CAPA users 
Subject: Re: [LON-CAPA-users] Video Viewing Problem

Gene,

>
> ... in Student mode I get the following error: No video with supported format 
> and MIME type found.
>

What is the file extension of the video?
Or is this a Camtasia video, or similar, which is typically launched within a 
.html file and requires ancillary files to function correctly?  

If so, a solution may be to include allow tags for each of the ancillary files 
in the appropriate html files which are containers for the video, e.g., 

  etc.

Can you provide the URL for this video in Resource Space, i.e., /res/purdue/ ...

Stuart Raeburn
LON-CAPA Academic Consortium

From: LON-CAPA-users  on behalf of 
Harding, Gene L 
Sent: Wednesday, August 28, 2019 3:05 PM
To: Discussion list for LON-CAPA users
Subject: [LON-CAPA-users] Video Viewing Problem

Hi everyone,

My students are not able to view a video I have posted on my LON-CAPA sections. 
This video is posted in my author space, and published. If I try to play it in 
Course Coordinator mode it works fine, but in Student mode I get the following 
error: No video with supported format and MIME type found.
[cid:image001.png@01D55DB2.18C9AE10]

Our LON-CAPA specialist has taken another job, so he is not available, and I'm 
sure the IT folks in general are buried right now. I have received no feedback 
from IT that they are even looking at the problem, and am hoping this is 
something easy that I can fix, but I am puzzled. Anyone recognize the symptom 
and underlying cause?

Thanks,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/<https://urldefense.proofpoint.com/v2/url?u=https-3A__polytechnic.purdue.edu_south-2Dbend_=DwMFAg=nE__W8dFE-shTxStwXtp0A=VsGo3jOm8tGLd6f-KlhT-g=FNwS52pjeR-kmMxGMRhGcLqV6wykWZVLcTvFe8WCAkU=WcWnoIkqMC_Ru5mwoGGEvNkpqawQ6X0Fn6k9lHKk3Wc=>

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Re: [LON-CAPA-users] Video Viewing Problem

[Harding, Gene L]

Hi Gerd,

Thanks for the suggestion. I tried doing that, and waited several minutes for 
it to take effect, but no luck. I still get the same error in Student mode.

BR,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

-Original Message-
From: LON-CAPA-users  On Behalf Of 
Kortemeyer, Gerd
Sent: Wednesday, August 28, 2019 3:59 PM
To: Discussion list for LON-CAPA users 
Subject: Re: [LON-CAPA-users] Video Viewing Problem

Hi,

I would recommend to try to publish the video file “Public”, i.e., without 
access control.

- Gerd.

> On Aug 28, 2019, at 21:13, Prof. Susan Masten  wrote:
> 
> Hi all,
> 
> I have had the same problem for quite some time now and have not been able to 
> figure out how to fix it. 
> 
> Susan
> 
> On 8/28/2019 3:05 PM, Harding, Gene L wrote:
>> Hi everyone,
>>  
>> My students are not able to view a video I have posted on my LON-CAPA 
>> sections. This video is posted in my author space, and published. If I try 
>> to play it in Course Coordinator mode it works fine, but in Student mode I 
>> get the following error: No video with supported format and MIME type found.
>> 
>>  
>> Our LON-CAPA specialist has taken another job, so he is not available, and 
>> I’m sure the IT folks in general are buried right now. I have received no 
>> feedback from IT that they are even looking at the problem, and am hoping 
>> this is something easy that I can fix, but I am puzzled. Anyone recognize 
>> the symptom and underlying cause?
>>  
>> Thanks,
>>  
>> Gene L. Harding, PE
>> Associate Professor of ECET
>> Purdue University
>> 574-520-4190
>> https://polytechnic.purdue.edu/south-bend/
>>  
>> 
>> 
>> ___
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>> 
>> LON-CAPA-users@mail.lon-capa.org
>> http://mail.lon-capa.org/mailman/listinfo/lon-capa-users
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> https://urldefense.proofpoint.com/v2/url?u=http-3A__mail.lon-2Dcapa.org_mailman_listinfo_lon-2Dcapa-2Dusers=DwICAg=nE__W8dFE-shTxStwXtp0A=eJriEjbucRYp5T72QIzOAQ=ISYnhFDzmnZZ-rHX_ZSOfS-n2ZDCKHGkpD-xrVWCvP8=I9k8hJ10OC4a-sO8lJIB-apL5trATS2cAHje0R98VbM=
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[LON-CAPA-users] Video Viewing Problem

[Harding, Gene L]

Hi everyone,

My students are not able to view a video I have posted on my LON-CAPA sections. 
This video is posted in my author space, and published. If I try to play it in 
Course Coordinator mode it works fine, but in Student mode I get the following 
error: No video with supported format and MIME type found.
[cid:image001.png@01D55DB2.18C9AE10]

Our LON-CAPA specialist has taken another job, so he is not available, and I'm 
sure the IT folks in general are buried right now. I have received no feedback 
from IT that they are even looking at the problem, and am hoping this is 
something easy that I can fix, but I am puzzled. Anyone recognize the symptom 
and underlying cause?

Thanks,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190
https://polytechnic.purdue.edu/south-bend/

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Re: [LON-CAPA-users] functionplotresponse problems

[Harding, Gene L]

Hi HK,

I gave up on using the standard functionplotresponse for what I was doing. The 
attached code works with Geogebra and gnuplot, and uses custom response to 
evaluate the submissions. The application is a mixer in a superheterodyne 
receiver. It’s pretty complex, about 700 lines counting comments, but a good 
bit of that complexity is the computation of values for the harmonics and cross 
products, then ordering them correctly in their respective arrays.

This may be more than what you want to dig into, but thought I would share it 
just in case.

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
Purdue University
574-520-4190

From: LON-CAPA-users  On Behalf Of H. 
K. Ng
Sent: Saturday, June 1, 2019 12:10 PM
To: Discussion list for LON-CAPA users 
Subject: [LON-CAPA-users] functionplotresponse problems

Good morning,

I am looking for examples of functionplotresponse problems (one where a student 
can resize/drag a vector,..) Let me know if you don't mind sharing the source 
codes. Thanks.

Regards,
-hk














$num_harms = 3;  # 
Number of harmonics for signals a and b
$xprod_mn  = 2;  # 
Cross product m & n values --> m**2 cross products

### Calculate harmonics 
#
#$fa[1] = 4;  $A[1] = 11;   # Fundamental freq in MHz and magn in V of signal 
a; fixed values used in development
$fa[1]= random(3,5,1);  $A[1]  = 11; # Fundamental freq 
in MHz and magn in V of signal a
for ($i=2; $i<=$num_harms; $i++) 
{ $fa[$i] = $i*$fa[1];  $A[$i] = &max(11-2*($i-1),1); }  # Signal a 
harmonics
#$fb[1] = 8;  $B[1] = 11;   # Fundamental freq in MHz and magn in V of signal 
b; fixed values used in development
$fb[1]= &random(6,10,2); $B[1]  = 11;# Fundamental freq 
in MHz and magn in V of signal b
for ($i=2; $i<=$num_harms; $i++)
{ $fb[$i] = $i*$fb[1];  $B[$i] = &max(11-2*($i-1),1); }  # Signal b 
harmonics
#

 Calculate cross products 
###
$cp_count = 0; # Element to track # 
x-prod's array size
for ($i=1; $i<=$xprod_mn; $i++)# Cycle through first 
column
{for ($j=1; $j<=$xprod_mn; $j++)   # Cycle through second 
column: 1 per sum freq, 1 per diff freq
 {$cp_count++;
  $cp[$cp_count] = $fa[$i]+$fb[$j];  # Add frequency sum 
element (lower case) to frequency array
  $CP[$cp_count] = &max(13-2*($i+$j),1); # Add magnitude 
element (upper case) to magnitude array
  if (&abs($fa[$i]-$fb[$j]) != 0)# If frequency diff 
element <> 0, add this element to array
 {$cp_count++;
  $cp[$cp_count] = &abs($fa[$i]-$fb[$j]);  # Add frequency diff 
element (lower case) to frequency array
  $CP[$cp_count] = &max(13-2*($i+$j),1);   # Add magnitude 
element (upper case) to frequency array
 }
 }
}
#

### Set up harmonic plot arrays 
#
for ($i=1; $i<=$num_harms; $i++)  
 {$f[$i-1] = $fa[$i];   $mag[$i-1] = $A[$i];}   # Put 
signal a harmonics in lower part of frequency array
for ($i=1; $i<=$num_harms; $i++)  
 {$f[$i+$num_harms-1] = $fb[$i];  $mag[$i+$num_harms-1] = $B[$i];}  # Put 
signal b harmonics in upper part of frequency array

for ($i=$num_harms*2-2; $i>=0; $i--)  # Bubble sort 
frequency (f) and magnitude (mag) arrays
 { for ($j=0; $j<=$i; $j++) # Inner 
loop, swaps elements one at a time if out of order
 { if ( $f[$j] > $f[$j+1] ) # If 
elements out of order, swap elements
  { $temp=$f[$j];   $f[$j]  =$f[$j+1];   $f[$j+1]=$temp;# Swap 
frequencies
$temp=$mag[$j]; $mag[$j]=$mag[$j+1]; $mag[$j+1]=$temp;  # Swap 
magnitudes
  }
 }
 }

do { # Order 
vectors at same freq from largest to smallest
$swap = 0; # 
Initialize to false
for ($i=0; $i<=$num_harms*2-2; $i++)
{ if (($f[$i]==$f[$i+1]) && ($mag[$i] < $mag[$i+1]))   # If 
same frequency and second vector is larger --> swap
 { $temp=$f[$i];   $f[$i]  =$f[$i+1];   $f[$i+1]=$temp;# Swap 
frequencies
   $temp=$mag[$i]; $mag[$i]=$mag[$i+1]; $mag[$i+1]=$temp;  # Swap 
magnitudes
 

Re: [LON-CAPA-users] Custom Response Partial Credit

[Harding, Gene L]

Hi Jacob,

Thank you. I have managed to get it to respond correctly (red incorrect of 
total_score==0, tan partial credit if 0<total_score<1, and green correct if 
total_score==1). I have run quite a few tests and it seems to work fine with 
only this statement:
return ('ASSIGNED_SCORE',$total_score);

I am still having one problem. There is a conditional block that shows a 
gnuplot of the correct answer if it is wrong and maxtries has been met. Before 
I converted to the customresponse the block worked fine, but now the 
_status function returns 1 no matter what, whether wrong, correct, or 
partially correct. Does that function not work with customresponse? If not, is 
there a LON-CAPA parameter for number of tries used? If so, I could compare 
that parameter to maxtries and do the same thing.

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190

From: LON-CAPA-users <lon-capa-users-boun...@mail.lon-capa.org> On Behalf Of 
Jacob Bond
Sent: Friday, May 18, 2018 7:45 PM
To: Discussion list for LON-CAPA users <lon-capa-users@mail.lon-capa.org>
Subject: Re: [LON-CAPA-users] Custom Response Partial Credit


Hi Gene,



You're right that the last return statement shouldn't be there.  Also, there is 
a subtlety about returning 'INCORRECT' in a partial credit problem.  If a 
student submits an answer that gets 1/2 credit, then changes it to an answer 
that gets 0 credit, returning 'INCORRECT' will leave the student with 1/2 
credit.  Perhaps this is what you want, but if not,



if ($total_score == 1) {return 'EXACT_ANS';}

else {return ('ASSIGNED_SCORE', $total_score);}



will suffice (if you know $total_score is between 0 and 1, inclusive).  (Also, 
it's possible that you can forget about the if statement entirely, in case 
LON-CAPA knows that ('ASSIGNED_SCORE', 1) is the same as 'EXACT_ANS', but I've 
never bothered testing this.)



As for the real issue, it's tough to say what might be going wrong without 
seeing the rest of the code, but you might try computing $total_score locally 
in the answer block and see if that fixes anything.  If you want to check what 
credit the student has received, this will set $partial_credit to what credit 
the student has received, or 0 if the student hasn't attempted the problem yet 
(ID should be replaced by the part ID of the problem part):



$partial_credit = _data('awarded', ID) ? _data('awarded', ID) : 
0.0;



Best,

Jacob


From: LON-CAPA-users 
<lon-capa-users-boun...@mail.lon-capa.org<mailto:lon-capa-users-boun...@mail.lon-capa.org>>
 on behalf of Harding, Gene L <glhar...@purdue.edu<mailto:glhar...@purdue.edu>>
Sent: Friday, May 18, 2018 5:54:22 PM
To: Discussion list for LON-CAPA users
Subject: [LON-CAPA-users] Custom Response Partial Credit


Hi,



I rewrote the problem I have been working on so that it is now a custom 
response, but am having trouble getting it to properly grade the problem 
submission. This is the code for grading inside the answer block:

 if ($total_score == 1) { return 'EXACT_ANS'; }

   elsif ($total_score > 0) { return ('ASSIGNED_SCORE',$total_score); }

   else  { return 'INCORRECT'; }

 return ('ASSIGNED_SCORE',$total_score);



I have tried it with and without the second return statement, but either way 
the Correct/Partially Correct/Incorrect grading seems almost random. 
$total_score is computed in a perl script higher up in the program, and I am 
outputting it to verify that it is being computed correctly. I also have a 
retrypartial parameter at the top of the program because I want the students to 
be able to take three tries at it on the practice version:





Can anyone see what I am doing wrong?



Thanks for any help/advice you can provide.



Best regards,



Gene L. Harding, PE

Associate Professor of ECET

574-520-4190


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[LON-CAPA-users] Custom Response Partial Credit

[Harding, Gene L]

Hi,

I rewrote the problem I have been working on so that it is now a custom 
response, but am having trouble getting it to properly grade the problem 
submission. This is the code for grading inside the answer block:
 if ($total_score == 1) { return 'EXACT_ANS'; }
   elsif ($total_score > 0) { return ('ASSIGNED_SCORE',$total_score); }
   else  { return 'INCORRECT'; }
 return ('ASSIGNED_SCORE',$total_score);

I have tried it with and without the second return statement, but either way 
the Correct/Partially Correct/Incorrect grading seems almost random. 
$total_score is computed in a perl script higher up in the program, and I am 
outputting it to verify that it is being computed correctly. I also have a 
retrypartial parameter at the top of the program because I want the students to 
be able to take three tries at it on the practice version:


Can anyone see what I am doing wrong?

Thanks for any help/advice you can provide.

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190

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[LON-CAPA-users] Plot Response Question

[Harding, Gene L]

Hi,

I am trying to code a plot response problem in which the student task is to 
plot six vectors on a frequency spectrum display. I would like to give 1/6 
credit for each vector that is plotted correctly. I am new to using Geogebra in 
this fashion.

I first tried using the LON-CAPA plot response approach, but was not successful 
in getting the partial credit assignment to work.

I then moved to the embedded applet approach described in the 2014 online 
video. I tried to create six problem parts, each graded separately, but 
Geogebra seems to limit me to one problem part per plot.

Then I tried making everything one problem part with multiple numeric 
responses, but LON-CAPA seems to want an all-or-nothing answer; no partial 
credit. I tried computing the total score and "return"ing it in ASSIGNED_SCORE 
like a custom response problem, but could not get that to work.

Then I tried adding a custom response to the end of the problem part to return 
ASSIGNED_SCORE, but now the response is always "Some items were not submitted" 
instead of "Correct" or "...partially correct."

I was trying to avoid using a custom response because the author guide says 
"this response type is generally discouraged," but have not been able to figure 
out a way so far.

Do I need to just do a custom response, or is there a way to code this without 
that approach? Is there a way to have multiple problem parts on a single 
Geogebra plot?

I think I am really close to getting this problem to work, but cannot quite get 
all of the pieces to work together nicely. Thank you for any help/advice you 
can provide.

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190

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Re: [LON-CAPA-users] Conditional Block Issue

[Harding, Gene L]

Oh, wow, that's all it was. Thank you Stuart and Yuk for spotting it. Sorry to 
email the listserv with such a dumb mistake!

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190

-Original Message-
From: LON-CAPA-users <lon-capa-users-boun...@mail.lon-capa.org> On Behalf Of 
Stuart Raeburn
Sent: Friday, May 11, 2018 8:11 PM
To: lon-capa-users@mail.lon-capa.org
Subject: Re: [LON-CAPA-users] Conditional Block Issue

Hello Gene,

Without looking in detail at your code, one thing jumped out at me when 
glancing at your code.

In the text included in your e-mail to the users list you have:



I don't know whether that's just a typo in your e-mail, but in your LON-CAPA 
code you'd want:




Stuart Raeburn
LON-CAPA Academic Consortium

Quoting "Harding, Gene L" <glhar...@purdue.edu>:

> Hi,
>
> I am trying to display something (a gnuplot) only if the student has

> exceeded the maxtries for a problem and not gotten it correct. I
used
> the following code in the perl script to check the problem status
and
> set a flag ($status_a) to zero only if maxtries is exceeded:
> # Check status: 'undef'=not attempted; 0=wrong but tries left; 
> 1=correct; 2=maxtries exceeded; 3=after answer date $status_a = 
> _status('a'); if ($status_a ne 2) {$status_a=0;}  # If maxtries 
> not reached, set
to
> 0 so conditional block does not execute
>
> Then I put the gnuplot code inside a conditional block:
> 
>  font="9" height="500" border="on" samples="100"
>           bgcolor="xff" fgcolor="x00" alttag="Spectrum Plot"  
> transparent="off" major_ticscale="2" plottype="Cartesian">
>       end="$xtic_stop" increment="$xtic_incr" start="0" />
>       increment="2" start="0" />
>       xmax="$x_max" />
>      Frequency (MHz)
>      Amplitude (V)
>       arrowstyle="filled" color="x00" pointtype="4"
>             linewidth="1" arrowhead="head" arrowlength="$arwhd"
pointsize="1">
> 
>          @f
>          @tails
>          @zeros
>          @mag
>      
> 
> 
>
> I thought conditional blocks were skipped if the condition was zero,

> and executed for nonzero values, but the block is executing even
when
> $status_a is zero. Can anyone see what I am doing wrong? Is there a 
> better/easier way to do this?
>
> Thanks for any help/advice you can provide.
>
> Best regards,
>
> Gene L. Harding, PE
> Associate Professor of ECET
> 574-520-4190
>
>

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[LON-CAPA-users] Conditional Block Issue

[Harding, Gene L]

Hi,

I am trying to display something (a gnuplot) only if the student has exceeded 
the maxtries for a problem and not gotten it correct. I used the following code 
in the perl script to check the problem status and set a flag ($status_a) to 
zero only if maxtries is exceeded:
# Check status: 'undef'=not attempted; 0=wrong but tries left; 1=correct; 
2=maxtries exceeded; 3=after answer date
$status_a = _status('a');
if ($status_a ne 2) {$status_a=0;}  # If maxtries not reached, set to 0 so 
conditional block does not execute

Then I put the gnuplot code inside a conditional block:





Frequency (MHz)
Amplitude (V)


@f
@tails
@zeros
@mag




I thought conditional blocks were skipped if the condition was zero, and 
executed for nonzero values, but the block is executing even when $status_a is 
zero. Can anyone see what I am doing wrong? Is there a better/easier way to do 
this?

Thanks for any help/advice you can provide.

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190

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Re: [LON-CAPA-users] LON-CAPA Conference and Workshop Registration Open

[Harding, Gene L]

Hi Gerd,

It would probably be helpful to add Purdue Memorial Union hotel contact info to 
the Accommodations page:
(800) 320-6291
https://union.purdue.edu/hotel/ 
There is contact info for the other hotels, but not the Union.

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190

-Original Message-
From: LON-CAPA-users  On Behalf Of 
Kortemeyer, Gerd
Sent: Wednesday, May 2, 2018 10:29 AM
To: Discussion list for LON-CAPA users 
Subject: [LON-CAPA-users] LON-CAPA Conference and Workshop Registration Open

Hi,

Registration for the 2018 LON-CAPA Conference and Workshop is now available,

http://support.loncapa.org/events/conf2018/

We would like to thank Purdue University for their generous support.

- Gerd.
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Re: [LON-CAPA-users] Hat Symbol

[Harding, Gene L]

Even better—thanks!

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190

From: LON-CAPA-users [mailto:lon-capa-users-boun...@mail.lon-capa.org] On 
Behalf Of Todd Ruskell
Sent: Tuesday, March 6, 2018 5:52 PM
To: Discussion list for LON-CAPA users <lon-capa-users@mail.lon-capa.org>
Subject: Re: [LON-CAPA-users] Hat Symbol

I usually use \vec rather than \overline for "normal" vectors.

On Tue, Mar 6, 2018 at 3:03 PM, Harding, Gene L 
<glhar...@purdue.edu<mailto:glhar...@purdue.edu>> wrote:
Hi Todd,

Yes, that works great. I noticed that \overline also works for “normal” 
vectors. Thanks!

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190<tel:(574)%20520-4190>

From: LON-CAPA-users 
[mailto:lon-capa-users-boun...@mail.lon-capa.org<mailto:lon-capa-users-boun...@mail.lon-capa.org>]
 On Behalf Of Todd Ruskell
Sent: Tuesday, March 6, 2018 4:40 PM
To: Discussion list for LON-CAPA users 
<lon-capa-users@mail.lon-capa.org<mailto:lon-capa-users@mail.lon-capa.org>>
Subject: Re: [LON-CAPA-users] Hat Symbol

Hi Gene,

You better sit down for it:  $\hat k$   For i-hat and j-hat, I prefer to 
use $\hat\imath$ and $\hat\jmath$ which removes the dots.

Hope that helps,
Todd

On Tue, Mar 6, 2018 at 2:33 PM, Harding, Gene L 
<glhar...@purdue.edu<mailto:glhar...@purdue.edu>> wrote:
Hi,

Does anyone know how to render the “hat” over a letter in LON-CAPA/XML to 
designate a unit vector?

Thanks,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190<tel:(574)%20520-4190>


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Re: [LON-CAPA-users] Hat Symbol

[Harding, Gene L]

Hi Todd,

Yes, that works great. I noticed that \overline also works for “normal” 
vectors. Thanks!

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190

From: LON-CAPA-users [mailto:lon-capa-users-boun...@mail.lon-capa.org] On 
Behalf Of Todd Ruskell
Sent: Tuesday, March 6, 2018 4:40 PM
To: Discussion list for LON-CAPA users <lon-capa-users@mail.lon-capa.org>
Subject: Re: [LON-CAPA-users] Hat Symbol

Hi Gene,

You better sit down for it:  $\hat k$   For i-hat and j-hat, I prefer to 
use $\hat\imath$ and $\hat\jmath$ which removes the dots.

Hope that helps,
Todd

On Tue, Mar 6, 2018 at 2:33 PM, Harding, Gene L 
<glhar...@purdue.edu<mailto:glhar...@purdue.edu>> wrote:
Hi,

Does anyone know how to render the “hat” over a letter in LON-CAPA/XML to 
designate a unit vector?

Thanks,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190<tel:(574)%20520-4190>


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[LON-CAPA-users] {Disarmed} RE: {Disarmed} Re: {Disarmed} RE: Matrix Operations

[Harding, Gene L]

DdfOZag=xsNJH7BRV_oHPnc9R-Alu7kBOiq31bgHu5mdx82zpYk=cZ0DC2thsyaawbW-icbHvABJUkZREthPLmF_-JF0ZzM=KgidnsKWCwkMXbk-KRSFP-SdawqedYPbXqeoqnxNC70=>
MailScanner has detected definite fraud in the website at 
"urldefense.proofpoint.com". Do not trust this website: MailScanner has 
detected definite fraud in the website at "urldefense.proofpoint.com". Do not 
trust this website: 
http://chethermo.net<https://urldefense.proofpoint.com/v2/url?u=http-3A__chethermo.net_=DwMFAg=OCIEmEwdEq_aNlsP4fF3gFqSN-E3mlr2t9JcDdfOZag=xsNJH7BRV_oHPnc9R-Alu7kBOiq31bgHu5mdx82zpYk=cZ0DC2thsyaawbW-icbHvABJUkZREthPLmF_-JF0ZzM=x_KHS9fqXQB-CLliVp9AUzDgDobPkHAATbQeAdqpNOQ=>





From: 
lon-capa-users-boun...@mail.lon-capa.org<mailto:lon-capa-users-boun...@mail.lon-capa.org>
 [mailto:lon-capa-users-boun...@mail.lon-capa.org] On Behalf Of Harding, Gene L
Sent: Saturday, February 10, 2018 9:56 PM
To: Discussion list for LON-CAPA users 
<lon-capa-users@mail.lon-capa.org<mailto:lon-capa-users@mail.lon-capa.org>>
Subject: [LON-CAPA-users] Matrix Operations



Hi,



Does LON-CAPA have any provision for doing matrix operations (e.g., 
multiplication, inverse calculation or equivalent of the MATLAB "\" operator)?



Best regards,



Gene L. Harding, PE

Associate Professor of ECET

574-520-4190
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[LON-CAPA-users] Geogebra Vector Plot Problem

[Harding, Gene L]

Hi,

Does anyone who knows how to use Geogebra within LON-CAPA know how to do this?

I am trying to make a functionplotresponse question that requires students to 
draw a vector pointing straight up from and attached to the x-axis, but without 
drawing an explicit attachment point on the axis.

If I use this approach it works, but the vector tail attaching point is plotted 
and visible:



...




 on the graph:

Here is the result:
[cid:image005.jpg@01D397A0.2AA69C80]

If I change "F1a_tail" in the above code to "(6,0)" it does not work:
[cid:image006.jpg@01D397A0.2AA69C80]

Is there a way I can specify a tail attachment point without showing it on the 
graph?

Thanks,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190

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Re: [LON-CAPA-users] Registration now open for 2017 Conference and Workshop!

[Harding, Gene L]

Oops, sorry everyone. I meant to send this directly to Gerd, not the listserv. 
Please disregard!

Best regards,

Gene L. Harding
Associate Professor of ECET
574-520-4190

-Original Message-
From: lon-capa-users-boun...@mail.lon-capa.org 
[mailto:lon-capa-users-boun...@mail.lon-capa.org] On Behalf Of Harding, Gene L
Sent: Friday, March 17, 2017 2:47 PM
To: Discussion list for LON-CAPA users <lon-capa-users@mail.lon-capa.org>
Subject: Re: [LON-CAPA-users] Registration now open for 2017 Conference and 
Workshop!

Hi Gerd,

I am having the same problem with the payment page that I had last year. After 
I confirm my credit card info I get the following message:
"For security reasons, we cannot accept your credit card."

I spent a lot of time fighting with this last year and never got it to take my 
Purdue credit card...

Gene L. Harding
Associate Professor of ECET
574-520-4190

-Original Message-
From: lon-capa-users-boun...@mail.lon-capa.org 
[mailto:lon-capa-users-boun...@mail.lon-capa.org] On Behalf Of Gerd Kortemeyer
Sent: Saturday, March 11, 2017 1:26 AM
To: Discussion list for LON-CAPA users <lon-capa-users@mail.lon-capa.org>; list 
about administration and system updating <lon-capa-ad...@mail.lon-capa.org>; 
lon-capa-annou...@mail.lon-capa.org
Subject: [LON-CAPA-users] Registration now open for 2017 Conference and 
Workshop!

Hi,

The Registration for the 2017 LON-CAPA Conference and Workshop is now open at

http://support.loncapa.org/events/conf2017/

We will take this conference as an opportunity to celebrate 25 years of history,

http://www.lon-capa.org/anniversary.html (and we’ll update that page)!

Hope to see you there!

- Gerd.

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Re: [LON-CAPA-users] Registration now open for 2017 Conference and Workshop!

[Harding, Gene L]

Hi Gerd,

I am having the same problem with the payment page that I had last year. After 
I confirm my credit card info I get the following message:
"For security reasons, we cannot accept your credit card."

I spent a lot of time fighting with this last year and never got it to take my 
Purdue credit card...

Gene L. Harding
Associate Professor of ECET
574-520-4190

-Original Message-
From: lon-capa-users-boun...@mail.lon-capa.org 
[mailto:lon-capa-users-boun...@mail.lon-capa.org] On Behalf Of Gerd Kortemeyer
Sent: Saturday, March 11, 2017 1:26 AM
To: Discussion list for LON-CAPA users ; list 
about administration and system updating ; 
lon-capa-annou...@mail.lon-capa.org
Subject: [LON-CAPA-users] Registration now open for 2017 Conference and 
Workshop!

Hi,

The Registration for the 2017 LON-CAPA Conference and Workshop is now open at

http://support.loncapa.org/events/conf2017/

We will take this conference as an opportunity to celebrate 25 years of history,

http://www.lon-capa.org/anniversary.html (and we’ll update that page)!

Hope to see you there!

- Gerd.

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Re: [LON-CAPA-users] Function Plot Response Partial Credit Grading

[Harding, Gene L]

Hi Jacob,

Thank you for your replies. I think I'd better go with a paper homework for 
now, and come back to this in the summer. Thanks again for taking time to 
respond.

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190
Purdue University-South Bend

From: lon-capa-users-boun...@mail.lon-capa.org 
[mailto:lon-capa-users-boun...@mail.lon-capa.org] On Behalf Of Jacob Bond
Sent: Wednesday, January 25, 2017 9:40 PM
To: Discussion list for LON-CAPA users <lon-capa-users@mail.lon-capa.org>
Subject: Re: [LON-CAPA-users] Function Plot Response Partial Credit Grading


Hi Gene,



That might not work so well then.  customresponse is used when you embed a 
custom GeoGebra applet in the problem and talk back forth with the applet using 
JavaScript.  I'm not sure if there is a way to do partial credit without a 
customresponse.



Jacob


From: 
lon-capa-users-boun...@mail.lon-capa.org<mailto:lon-capa-users-boun...@mail.lon-capa.org>
 
<lon-capa-users-boun...@mail.lon-capa.org<mailto:lon-capa-users-boun...@mail.lon-capa.org>>
 on behalf of Harding, Gene L <glhar...@purdue.edu<mailto:glhar...@purdue.edu>>
Sent: Wednesday, January 25, 2017 4:18:10 PM
To: Discussion list for LON-CAPA users
Subject: Re: [LON-CAPA-users] Function Plot Response Partial Credit Grading

Hi Jacob,

I was using a functionplotresponse because that is the only way I know to call 
Geogebra. (Pardon my ignorance; I'm very new to this.) Is there a way to mix a 
functionplotresponse with a customresponse, or is there a way to implement the 
Geogebra functions without using a customplotresponse?

Thanks,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190
Purdue University-South Bend

From: 
lon-capa-users-boun...@mail.lon-capa.org<mailto:lon-capa-users-boun...@mail.lon-capa.org>
 [mailto:lon-capa-users-boun...@mail.lon-capa.org] On Behalf Of Jacob Bond
Sent: Wednesday, January 25, 2017 11:50 AM
To: Discussion list for LON-CAPA users 
<lon-capa-users@mail.lon-capa.org<mailto:lon-capa-users@mail.lon-capa.org>>
Subject: Re: [LON-CAPA-users] Function Plot Response Partial Credit Grading


Hi Gene,



Yes, there is a way to do partial credit.  If you are already using a 
customresponse to grade the GeoGebra problems, then it won't be too difficult.  
To assign partial credit, you need some kind of counter in your answer 
algorithm to determine how many the student got correct, then just do



return ('ASSIGNED_SCORE', $correct/$total);



There is an example problem for partial credit, in the templates it is under 
Free Form Problems and is called Custom Response with Partial Credit.



If you want students to be given multiple attempts, you need insert a 
"Parameters for a part" with this information:







Finally, if you do give them multiple attempts, you shouldn't do `return 
'INCORRECT';` as in the example problem, because this will not overwrite their 
score with a 0.  So if they got one right, then moved it, and you did `return 
'INCORRECT';`, they would still have a score of 0.16667.  Instead, the 
algorithm needs to assign a score of 0, which would be taken care of by the 
above since `$correct` would be 0.



Jacob


From: 
lon-capa-users-boun...@mail.lon-capa.org<mailto:lon-capa-users-boun...@mail.lon-capa.org>
 
<lon-capa-users-boun...@mail.lon-capa.org<mailto:lon-capa-users-boun...@mail.lon-capa.org>>
 on behalf of Harding, Gene L <glhar...@purdue.edu<mailto:glhar...@purdue.edu>>
Sent: Wednesday, January 25, 2017 9:56:25 AM
To: 'lon-capa-users@mail.lon-capa.org'
Subject: [LON-CAPA-users] Function Plot Response Partial Credit Grading

Hi,

Sorry for another post, but the problems I have been constructing in recent 
weeks use areas that are new to me, such as gnuplot and Geogebra. I keep 
getting close, but not quite finishing some of the new problems.

Right now I am building a quiz question that requires students to place six 
vectors on a single set of axes. I have figured out how to place the initial 
vectors for them to move into place, then separately evaluate the correctness 
of each vector. Is there a way to assign 1/6 of the grade for each vector, so 
if a student places some of them correctly but some incorrectly, they get 
partial credit on the problem instead of all/none? I thought I might be able to 
do this with some pre- or post-processing of the answer(s), but the standard 
LON-CAPA examples I have found have no comments in the code, and I have not 
been able to figure them out (if that is even the right approach...).

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190
Purdue University-South Bend

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Re: [LON-CAPA-users] Function Plot Response Partial Credit Grading

[Harding, Gene L]

Sorry, I meant functionplotresponse, not customplotresponse.

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190
Purdue University-South Bend

From: lon-capa-users-boun...@mail.lon-capa.org 
[mailto:lon-capa-users-boun...@mail.lon-capa.org] On Behalf Of Harding, Gene L
Sent: Wednesday, January 25, 2017 4:18 PM
To: Discussion list for LON-CAPA users <lon-capa-users@mail.lon-capa.org>
Subject: Re: [LON-CAPA-users] Function Plot Response Partial Credit Grading

Hi Jacob,

I was using a functionplotresponse because that is the only way I know to call 
Geogebra. (Pardon my ignorance; I'm very new to this.) Is there a way to mix a 
functionplotresponse with a customresponse, or is there a way to implement the 
Geogebra functions without using a customplotresponse?

Thanks,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190
Purdue University-South Bend

From: 
lon-capa-users-boun...@mail.lon-capa.org<mailto:lon-capa-users-boun...@mail.lon-capa.org>
 [mailto:lon-capa-users-boun...@mail.lon-capa.org] On Behalf Of Jacob Bond
Sent: Wednesday, January 25, 2017 11:50 AM
To: Discussion list for LON-CAPA users 
<lon-capa-users@mail.lon-capa.org<mailto:lon-capa-users@mail.lon-capa.org>>
Subject: Re: [LON-CAPA-users] Function Plot Response Partial Credit Grading


Hi Gene,



Yes, there is a way to do partial credit.  If you are already using a 
customresponse to grade the GeoGebra problems, then it won't be too difficult.  
To assign partial credit, you need some kind of counter in your answer 
algorithm to determine how many the student got correct, then just do



return ('ASSIGNED_SCORE', $correct/$total);



There is an example problem for partial credit, in the templates it is under 
Free Form Problems and is called Custom Response with Partial Credit.



If you want students to be given multiple attempts, you need insert a 
"Parameters for a part" with this information:







Finally, if you do give them multiple attempts, you shouldn't do `return 
'INCORRECT';` as in the example problem, because this will not overwrite their 
score with a 0.  So if they got one right, then moved it, and you did `return 
'INCORRECT';`, they would still have a score of 0.16667.  Instead, the 
algorithm needs to assign a score of 0, which would be taken care of by the 
above since `$correct` would be 0.



Jacob


From: 
lon-capa-users-boun...@mail.lon-capa.org<mailto:lon-capa-users-boun...@mail.lon-capa.org>
 
<lon-capa-users-boun...@mail.lon-capa.org<mailto:lon-capa-users-boun...@mail.lon-capa.org>>
 on behalf of Harding, Gene L <glhar...@purdue.edu<mailto:glhar...@purdue.edu>>
Sent: Wednesday, January 25, 2017 9:56:25 AM
To: 'lon-capa-users@mail.lon-capa.org'
Subject: [LON-CAPA-users] Function Plot Response Partial Credit Grading

Hi,

Sorry for another post, but the problems I have been constructing in recent 
weeks use areas that are new to me, such as gnuplot and Geogebra. I keep 
getting close, but not quite finishing some of the new problems.

Right now I am building a quiz question that requires students to place six 
vectors on a single set of axes. I have figured out how to place the initial 
vectors for them to move into place, then separately evaluate the correctness 
of each vector. Is there a way to assign 1/6 of the grade for each vector, so 
if a student places some of them correctly but some incorrectly, they get 
partial credit on the problem instead of all/none? I thought I might be able to 
do this with some pre- or post-processing of the answer(s), but the standard 
LON-CAPA examples I have found have no comments in the code, and I have not 
been able to figure them out (if that is even the right approach...).

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190
Purdue University-South Bend

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[LON-CAPA-users] Function Plot Response Partial Credit Grading

[Harding, Gene L]

Hi,

Sorry for another post, but the problems I have been constructing in recent 
weeks use areas that are new to me, such as gnuplot and Geogebra. I keep 
getting close, but not quite finishing some of the new problems.

Right now I am building a quiz question that requires students to place six 
vectors on a single set of axes. I have figured out how to place the initial 
vectors for them to move into place, then separately evaluate the correctness 
of each vector. Is there a way to assign 1/6 of the grade for each vector, so 
if a student places some of them correctly but some incorrectly, they get 
partial credit on the problem instead of all/none? I thought I might be able to 
do this with some pre- or post-processing of the answer(s), but the standard 
LON-CAPA examples I have found have no comments in the code, and I have not 
been able to figure them out (if that is even the right approach...).

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190
Purdue University-South Bend

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Re: [LON-CAPA-users] Unordered Response Question Error

[Harding, Gene L]

Hi Carl,

Thank you for sending that. As it turns out, in this particular problem the 
answers are integers and a tolerance of zero works, but I will definitely keep 
that in mind in the future.

BR,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190
Purdue University-South Bend

From: lon-capa-users-boun...@mail.lon-capa.org 
[mailto:lon-capa-users-boun...@mail.lon-capa.org] On Behalf Of Carl Lira
Sent: Tuesday, January 24, 2017 8:16 PM
To: 'Discussion list for LON-CAPA users' <lon-capa-users@mail.lon-capa.org>
Subject: Re: [LON-CAPA-users] Unordered Response Question Error

I don't see the script, but you need to have a tolerance. When the value is not 
specified, it defaults to an absolute tolerance of zero. If a floating point 
calculation is done, it will never be exactly an integer. From the author 
manual:

A tolerance parameter determines how closely the system will require the 
student's
answer to be in order to count it correct. The tolerance will default to zero 
if it is not
defined. The tolerance parameter should always be defined for a numerical 
problem
unless you are certain only integer answers are generated from your script and 
you
want students to reply with exactly that integer.
If the computer answer is a floating point number, the tolerance should not be 
zero.
Computers can only approximate computations involving real numbers. For 
instance,
a computer's [decimal] answer to the simple problem 1
3 is "0.1". It
should be an infinite series of 3's, and there certainly shouldn't be a "1" in 
the an-
swer, but no computer can represent an infinitely long, infinitely detailed 
real number.
Therefore, for any problem where the answer is not an integer, you need to 
allow a
tolerance factor, or the students will find it nearly impossible to exactly 
match the
computer's idea of the answer. You may find the default tolerance too large for 
some
problems, so adjust as appropriate.


Hm, I think that last line should say "if you use the colorful editor tolerance 
template, the default tolerance may be too large...". I think the template 
defaults to 5%.

the format affects the display, not the calculations.

From: 
lon-capa-users-boun...@mail.lon-capa.org<mailto:lon-capa-users-boun...@mail.lon-capa.org>
 [mailto:lon-capa-users-boun...@mail.lon-capa.org] On Behalf Of Harding, Gene L
Sent: Tuesday, January 24, 2017 8:23 AM
To: Discussion list for LON-CAPA users 
<lon-capa-users@mail.lon-capa.org<mailto:lon-capa-users@mail.lon-capa.org>>
Subject: Re: [LON-CAPA-users] Unordered Response Question Error

Hi Carl,

The ! was commenting out the parameter, something I tried among several 
permutations of syntax hoping to get something to work. The error message is 
the same whether it is there or commented out. I originally also had a sig figs 
param in it, but deleted it. I think that eliminated one error.

I have tried putting the unit= and format= in the answer and value fields, but 
no luck there, either.

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190
Purdue University-South Bend

From: 
lon-capa-users-boun...@mail.lon-capa.org<mailto:lon-capa-users-boun...@mail.lon-capa.org>
 [mailto:lon-capa-users-boun...@mail.lon-capa.org] On Behalf Of Carl Lira
Sent: Monday, January 23, 2017 11:22 PM
To: 'Discussion list for LON-CAPA users' 
<lon-capa-users@mail.lon-capa.org<mailto:lon-capa-users@mail.lon-capa.org>>
Subject: Re: [LON-CAPA-users] Unordered Response Question Error

not sure of the impact of the ! in the responseparam field. I believe you 
should have some tolerance if you have a calculated real number, e.g.






From: 
lon-capa-users-boun...@mail.lon-capa.org<mailto:lon-capa-users-boun...@mail.lon-capa.org>
 [mailto:lon-capa-users-boun...@mail.lon-capa.org] On Behalf Of Harding, Gene L
Sent: Monday, January 23, 2017 10:00 PM
To: 'lon-capa-users@mail.lon-capa.org' 
<lon-capa-users@mail.lon-capa.org<mailto:lon-capa-users@mail.lon-capa.org>>
Subject: [LON-CAPA-users] Unordered Response Question Error

Hi,

I am trying to embed some unordered numericalresponse parameters inside an xml 
table. I modeled my xml after the example in LON-CAPA, but am having two 
problems with it. The first problem is an error referring to tolerance range, 
and the second is incompatible units. This is a screenshot:
[cid:image001.jpg@01D276E4.733722E0]

This is the code I am using:

A $Pa dBm, $fa-MHz RF input signal and a $Pb dBm, $fb-MHz LO signal are applied 
to a nonlinear mixer with $Zin- impedance. Complete the table of IF 
cross products for m,n equal 1,2.



  
 mn|mfa  nfb| 
   Cross Products 
  
  
1  1




$fa
$fb






  $f11_1 MHz $f11_2 MHz
  
  
1  2
  
  
2  1
  
  
2  2
  




Any ideas why I am getting these two errors?

Thanks for any advice you can provide.

Best regards,

Re: [LON-CAPA-users] Unordered Response Question Error

[Harding, Gene L]

Hi Damien,

Thank you for the info, and for entering the bug. I will restructure the 
problem to work around the units issue for now.

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190
Purdue University-South Bend

-Original Message-
From: lon-capa-users-boun...@mail.lon-capa.org 
[mailto:lon-capa-users-boun...@mail.lon-capa.org] On Behalf Of Damien Guillaume
Sent: Tuesday, January 24, 2017 10:31 AM
To: Discussion list for LON-CAPA users 
Subject: Re: [LON-CAPA-users] Unordered Response Question Error

> Any ideas why I am getting these two errors?

I think that units are simply not supported by LON-CAPA when you use an 
answergroup and 2 textline elements. I created a bug report about it:
http://bugs.lon-capa.org/show_bug.cgi?id=6844

Damien
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[LON-CAPA-users] Unordered Response Question Error

[Harding, Gene L]

Hi,

I am trying to embed some unordered numericalresponse parameters inside an xml 
table. I modeled my xml after the example in LON-CAPA, but am having two 
problems with it. The first problem is an error referring to tolerance range, 
and the second is incompatible units. This is a screenshot:
[cid:image001.jpg@01D275C3.FE604440]

This is the code I am using:

A $Pa dBm, $fa-MHz RF input signal and a $Pb dBm, $fb-MHz LO signal are applied 
to a nonlinear mixer with $Zin- impedance. Complete the table of IF 
cross products for m,n equal 1,2.



  
 mn|mfa  nfb| 
   Cross Products 
  
  
1  1




$fa
$fb






  $f11_1 MHz $f11_2 MHz
  
  
1  2
  
  
2  1
  
  
2  2
  




Any ideas why I am getting these two errors?

Thanks for any advice you can provide.

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190
Purdue University-South Bend

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Re: [LON-CAPA-users] Algebra Expression Rendering in LON-CAPA

[Harding, Gene L]

Thanks Damien--that worked nicely! And thanks to everyone who responded with 
help. I should have posed these questions to the list earlier...would have 
saved me a lot of time!

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190
Purdue University-South Bend


-Original Message-
From: lon-capa-users-boun...@mail.lon-capa.org 
[mailto:lon-capa-users-boun...@mail.lon-capa.org] On Behalf Of Damien Guillaume
Sent: Tuesday, January 17, 2017 3:57 PM
To: Discussion list for LON-CAPA users 
Subject: Re: [LON-CAPA-users] Algebra Expression Rendering in LON-CAPA


> Thanks Damien! That is very helpful. Is there an easy way to display 
> the large numbers with commas (e.g., 32000 -> 32,000)? I tried a 
> couple of different format commands using ",0f", but neither worked. 
> Also, is there a good reference out there to help novices like me with 
> the syntax for these commands? I'm having a hard time keeping the xml, 
> perl, tex, etc. straight. (And have wasted a LOT of time trying to 
> figure it out.)

You are not the only one. Currently your best help for LON-CAPA specific syntax 
is the author manual at /adm/help/author.manual.pdf . For XML, Perl and TeX, 
you will have to look at other documentations on the web.

I found that  (which is mentionned in the author manual) works for 
me to get commas, for instance:

$$ \frac{$numer}{$denom} \left[ \pi + 
\sum_{n=1}^{\infty} \frac{$sum_numer}{$sum_denom_n_coeff n - $sum_denom_const} 
\cdot \sin(($w,',0f') nt) \right] $$

It also works when you call it within a Perl script, for instance:

...
$pretty_w = &prettyprint($w,', 0f');
$function= "\\frac{$numer}{$denom} \\left[ \\pi + \\sum_{n=1}^{\\infty} 
\\frac{$sum_numer}{$sum_denom_n_coeff n - $sum_denom_const} \\cdot 
\\sin($pretty_w nt) \\right]"; 

$$ $function $$

Damien

PS: I meant 'eval="on"' instead of 'eval="true"' in my previous email.
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Re: [LON-CAPA-users] Algebra Expression Rendering in LON-CAPA

[Harding, Gene L]

Hi Gerd, et al,



Sorry, but it is still not working. Now nothing is rendered at all, and I get 
this error:

[cid:image001.png@01D26DBF.D0AE4A30]



This is the function definition:

$function = "$numer/$denom  [pi + 
\\sum_{n=1}^{\infty}($sum_numer/($sum_denom_n_coeff n - 
$sum_denom_const))*sin($w nt)]";



This is the call from the xml to render it:

 $function



I think the  call is using Maxima, but I am so new to this that I am 
not positive.



I noticed something interesting when I compared the int and sum functionality. 
When I use “int” in the $function definition it needs no backslash at all, but 
does render the integral sign and arguments. “sum” on the other hand does not 
work either by itself, with one backslash, or with two backslashes. That makes 
me wonder if “sum” is the wrong keyword in that context. I don’t know…



Gene L. Harding, PE

Associate Professor of ECET

574-520-4190

Purdue University-South Bend





-Original Message-
From: lon-capa-users-boun...@mail.lon-capa.org 
[mailto:lon-capa-users-boun...@mail.lon-capa.org] On Behalf Of Gerd Kortemeyer
Sent: Friday, January 13, 2017 11:16 AM
To: Discussion list for LON-CAPA users <lon-capa-users@mail.lon-capa.org>
Subject: Re: [LON-CAPA-users] Algebra Expression Rendering in LON-CAPA



Hi,



Ah, okay, it’s inside Perl double quotes! Sorry, I did not catch that. In Perl, 
“\” is the escape character, so you’ll need “\\” - an escaped backslash.



Apologies, I didn’t make the connection the first time around.



- Gerd.

> On Jan 13, 2017, at 11:05 AM, Harding, Gene L 
> <glhar...@purdue.edu<mailto:glhar...@purdue.edu>> wrote:

>

> Hi,

>

> I think the formatting may be different inside a function assignment. This is 
> what I get when I use the following syntax:

> $function = "$numer/$denom  [pi +

> \sum_{n=1}^{\infty}($sum_numer/($sum_denom_n_coeff n -

> $sum_denom_const))*sin($w nt)]";  Did I mess up the syntax?

>

>

> Gene L. Harding, PE

> Associate Professor of ECET

> 574-520-4190

> Purdue University-South Bend

>

> -Original Message-

> From: 
> lon-capa-users-boun...@mail.lon-capa.org<mailto:lon-capa-users-boun...@mail.lon-capa.org>

> [mailto:lon-capa-users-boun...@mail.lon-capa.org] On Behalf Of Gerd

> Kortemeyer

> Sent: Friday, January 13, 2017 10:39 AM

> To: Discussion list for LON-CAPA users

> <lon-capa-users@mail.lon-capa.org<mailto:lon-capa-users@mail.lon-capa.org>>

> Subject: Re: [LON-CAPA-users] Algebra Expression Rendering in LON-CAPA

>

> Hi,

>

> It’s \sum

>

> as in

>

> \sum_{n=1}^{\infty}

>

> - Gerd.

>

> > On Jan 13, 2017, at 10:29 AM, Harding, Gene L 
> > <glhar...@purdue.edu<mailto:glhar...@purdue.edu>> wrote:

> >

> > Hi,

> >

> > I am having trouble rendering an algebraic expression with a summation sign 
> > (capital Sigma). I want an expression that looks like this, using variables 
> > for the numeric portions of the expression:

> > 

> > I am able to render the integration sign using this code:

> > $function = "$numer/$denom  [pi + int($sum_numer/($sum_denom_n_coeff

> > n

> > - $sum_denom_const),1,3)*sin($w nt)]"; …providing an expression that looks 
> > like this:

> > 

> >

> > But when I try to render the summation sign using this code:

> > $function = "$numer/$denom  [pi + sum($sum_numer/($sum_denom_n_coeff

> > n

> > - $sum_denom_const),n,1,3)*sin($w nt)]"; …I get the following:

> > 

> >

> > I have spent a couple of hours looking through the Maxima Manual and other 
> > references, as well as some examples I have found online, but have not been 
> > able to figure out the syntax for rendering the summation sign. Can anyone 
> > offer advice on how to do this?

> >

> > Also, although not so important, if someone can tell me how to replace the 
> > outer parentheses with square brackets, and/or how to display the numeric 
> > part of the sine argument with commas (e.g., 90,000 vs 9), I would 
> > really appreciate it.

> >

> > Thanks,

> >

> > Gene L. Harding, PE

> > Associate Professor of ECET

> > 574-520-4190

> > Purdue University-South Bend

> >

> > ___

> > LON-CAPA-users mailing list

> > LON-CAPA-users@mail.lon-capa.org<mailto:LON-CAPA-users@mail.lon-capa.org>

> > http://mail.lon-capa.org/mailman/listinfo/lon-capa-users

>

> --

> Gerd Kortemeyer, Ph.D.

> Associate Professor of Physics

> Director, LON-CAPA Project

> Michigan State University

> http://www.msu.edu/user/kortemey/

>

>

>

>

&g

[LON-CAPA-users] Algebra Expression Rendering in LON-CAPA

[Harding, Gene L]

Hi,

I am having trouble rendering an algebraic expression with a summation sign 
(capital Sigma). I want an expression that looks like this, using variables for 
the numeric portions of the expression:
[cid:image003.jpg@01D26D87.FB7A6240]
I am able to render the integration sign using this code:
$function = "$numer/$denom  [pi + int($sum_numer/($sum_denom_n_coeff n - 
$sum_denom_const),1,3)*sin($w nt)]";
...providing an expression that looks like this:
[cid:image004.png@01D26D87.FB7A6240]

But when I try to render the summation sign using this code:
$function = "$numer/$denom  [pi + sum($sum_numer/($sum_denom_n_coeff n - 
$sum_denom_const),n,1,3)*sin($w nt)]";
...I get the following:
[cid:image005.png@01D26D87.FB7A6240]

I have spent a couple of hours looking through the Maxima Manual and other 
references, as well as some examples I have found online, but have not been 
able to figure out the syntax for rendering the summation sign. Can anyone 
offer advice on how to do this?

Also, although not so important, if someone can tell me how to replace the 
outer parentheses with square brackets, and/or how to display the numeric part 
of the sine argument with commas (e.g., 90,000 vs 9), I would really 
appreciate it.

Thanks,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190
Purdue University-South Bend

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[LON-CAPA-users] usage

[Harding, Gene L]

Hi,

In some of my multi-part problems I have had to hard-code the problem part in 
the text because when I use the  function it displays this: 
[cid:image001.png@01D26CFD.A4CEFD00]

Has anyone seen this before? ...know why it happens? In some problems it 
happens and in others it works correctly, displaying the appropriate part label 
specified in the part ID, e.g.,  results in the letter "a" being 
displayed.

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190
Purdue University-South Bend

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Re: [LON-CAPA-users] Quiz Timer Reset

[Harding, Gene L]

Oh, wow, that's really easy.  Thanks Mark!

Best regards,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190
Purdue University-South Bend

-Original Message-
From: lon-capa-users-boun...@mail.lon-capa.org 
[mailto:lon-capa-users-boun...@mail.lon-capa.org] On Behalf Of Lucas, Mark
Sent: Friday, August 26, 2016 10:54 AM
To: Discussion list for LON-CAPA users <lon-capa-users@mail.lon-capa.org>
Subject: Re: [LON-CAPA-users] Quiz Timer Reset

Gene,

Yes - Main Menu -> Modify Parameter Settings ->Reset Student Access TImes

This leads to a list of questions. Right off the bat select:

* Reset times on one or more folders/maps, resources or the course for a single 
student.

This will delete the time stamp that says when the student first accessed the 
folder.
Any work they did is still good, but it will treat the student, time wise, as 
if they have not accessed the folder before.

I hope this helps,

Mark

> On Aug 26, 2016, at 10:39 AM, Harding, Gene L <glhar...@purdue.edu> wrote:
> 
> Hi,
>  
> Is there a way to reset the timer parameter for a single student in an online 
> quiz in LON-CAPA?  I recently had a student, who was new to LON-CAPA, 
> misunderstand how the quizzes work.  He thought a three-question quiz was 
> three independent quizzes, so he did the first question, then returned later 
> to do the other two and found he was locked out.  I could not figure out how 
> to reset the timer parameter for him, and ultimately ended up deleting the 
> timer parameter for the entire class.  (Resetting those two questions in the 
> grading area did not work.)  Is there a way to reset the timer for one 
> student?
>  
> Thanks,
>  
> Gene L. Harding, PE
> Associate Professor of ECET
> 574-520-4190
> Purdue University-South Bend
>  
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-- 
Mark Lucas  email: 
luc...@ohiou.edu
252D Clippinger Lab phone: 
(740)597-2984
Department of Physics and Astronomy fax: (740)593-0433
Ohio University
Athens, OH 45701

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[LON-CAPA-users] Imaginary Numbers

[Harding, Gene L]

Hi,

Can LON-CAPA handle imaginary and complex numbers?  I am having trouble finding 
any info about it in the help.

Thanks,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190

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[LON-CAPA-users] Graphic Display Question

[Harding, Gene L]

Hi,

This is probably a very basic question, but is there an easy way to display a 
graphic beside its associated text instead of "in line" with it?  In the figure 
shown below, I would like to display the amplifier symbol to the right of the 
text rather than above or below it.  Is there an easy way to do that?

[cid:image003.jpg@01D1631E.DC7B93B0]

This is the code I am using for that portion of the problem:

The following parameters apply to the amplifier system shown below: 
Si = $Sin pW 
Ni = $Nin fW 
Ap = $A_dB dB 
Nd = $Nd_dBm dBm 





Thanks,

Gene L. Harding, PE
Associate Professor of ECET
574-520-4190

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Re: [LON-CAPA-users] New Content/Problem Editor - Input needed NOW

[Harding, Gene L]

I agree with both of Carl's suggestions.  He articulated the problems with the 
help much better than I did; I wholeheartedly agree with him.  There are some 
key places where context-sensitive help would be a great addition (e.g., 
Parameters for a response blocks Type parameter).  Code snippets would also 
be nice.  I have started saving some of my own (useful for EE, but probably no 
one else) in a text file so I can reuse them later.

Best regards,
Gene

Gene L. Harding, P.E.
Associate Professor of ECET
Purdue University
glhar...@purdue.edumailto:glhar...@purdue.edu
574-520-4190

From: lon-capa-users-boun...@mail.lon-capa.org 
[mailto:lon-capa-users-boun...@mail.lon-capa.org] On Behalf Of Carl Lira
Sent: Tuesday, October 21, 2014 8:17 PM
To: lon-capa-users@mail.lon-capa.org
Subject: Re: [LON-CAPA-users] New Content/Problem Editor - Input needed NOW

As a relatively new user, I found the colorful editor essential in learning to 
write proper problems. The colors are gaudy, but that really helps your eye in 
tracking since some nested boxes can become span several screens.

My main issue as a beginner with the colorful editor was the lack of contextual 
help, and understanding which fields are optional and which are required. The 
tolerance and sig figures boxes are optional for numerical integer answers but 
that is not clear when the template loads with a 5% tolerance. There is no 
contextual help for the green Numerical Response box. I'm glad improved 
contextual help is coming.

The flow of help is a concern. To get help on the problem without contextual 
help, you must click 'help' in the menu bar which immediately hides your work, 
then you browse through the manual to find the section, go a couple layers into 
help, where you realize that if you must click the browser back button to 
navigate back to the previous help menus, and if you click 'go back' in the 
menu bar, you go back to your problem and lose your place in help. Agh!

So my main recommendations are to make sure that clicking 'help' does not hide 
your work in progress, and that contextual help is available to guide the users 
on what parts are required and what parts are optional, and that users can view 
their work and help at the same time without losing view of one.

Not really an editor detail, but in terms of the problem template menu, it 
would be good if there was a link to xml code in addition to the problem 
browser preview. As users get more experienced, copying an existing problem by 
xml is faster than creating one in the colorful editor. It is awkward to create 
a new problem just so that you can copy a snippet of xml from a template.

I caution that most response from this listserv will be advanced users who are 
comfortable coding xml, not the beginning users. The experienced users on this 
listserv will be biased to xml, but the new users need to have a colorful 
editor. If you want to get a larger set of users, a better interactive editor 
is necessary.

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Re: [LON-CAPA-users] New Content/Problem Editor - Input needed NOW

[Harding, Gene L]

This is not really an editing issue, but…another thing I would like to see is 
some indication of problem types in the folder lists:  numerical, multiple 
choice, matching, etc.  That is one of the few features I miss from Blackboard, 
where I could scan through my problem library and easily tell what type of 
problem a question was without opening the problem itself…something analogous 
to file extensions in DOS/Windows, where .doc and .docx indicate Word 
documents, .ppt and .pptx indicate PowerPoint documents, etc.
Gene L. Harding, P.E.
Associate Professor of ECET
Purdue University
glhar...@purdue.edumailto:glhar...@purdue.edu
574-520-4190
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Re: [LON-CAPA-users] 2014 conference registration now available

[Harding, Gene L]

Hi Gerd,
Unfortunately, RadarCon 2014 conflicts this year, and I am presenting a paper, 
so will not be able to make the LC conference this year.  I hope you all have a 
good conference, and I would be interested in catching up on the conference 
highlights if you publish any.
Best regards,
Gene

///
Gene L. Harding, P.E.
Associate Professor of ECET
Purdue University
574-520-4190

-Original Message-
From: lon-capa-users-boun...@mail.lon-capa.org 
[mailto:lon-capa-users-boun...@mail.lon-capa.org] On Behalf Of Gerd Kortemeyer
Sent: Wednesday, March 26, 2014 5:11 PM
To: Discussion list for LON-CAPA users; lon-capa-annou...@mail.lon-capa.org
Subject: [LON-CAPA-users] 2014 conference registration now available

Hi,

The subject line says it all: registration is now available for our 2014 
LON-CAPA Conference and Workshop,

https://support.loncapa.org/events/conf2014/

Use the Registration link in the box on the right.

We hope to welcome you in East Lansing!

- Gerd.
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