Hi,
For starters, I would use a problem with only one part and three answer fields
inside the customresponse. Evaluation of the input should be inside the
<answer>-block:
<customresponse …>
<startouttext />…<endouttext …>
<textline …>
<startouttext />…<endouttext …>
<textline …>
<startouttext />…<endouttext …>
<textline …>
<answer …>
</answer/>
</customresponse>
The answers will be in an array $$submission[0], $$submission[1], …
If any of those are (still) zero, return "MISSING_ANSWER"
In the very last step, calculate and check what you want, return "EXACT_ANS" or
"INCORRECT".
- Gerd.
On Sep 2, 2013, at 3:03 PM, Josh Wolosz <jwol...@slrsd.org> wrote:
> Hi Everyone,
>
> I have a question in regards to Custom Response problems. I would like to
> try moving some of my labs into lon-capa, and one of the first ones involves
> working with percent error (for high school freshman).
>
> Here's what I would like to have happen:
>
> 1) Students enter an estimated value
> 2) Students enter the actual/measured value
> 3) Students then input their percent error which loncapa calculates and
> determines if they are correct or not
>
> Here is the script I have tried:
>
> <script type="loncapa/perl">
> # Get the entered answer. First argument is partID, second is responseID
> $given=&submission(1,11);
> $example='You chose '.$given.' m';
> $given2=&submission(3,4);
> $example2='You chose '.$given2.' m';
> $a=&abs($given2-$given)/$given2;
> </script>
>
> I'm getting an error returned saying there is an illegal division by zero,
> specifically:
>
> $a=&abs($given2-$given)/$given2;
>
> I understand that at the beginning of the problem nothing has been submitted,
> so $given2 has no value. Is there a way around this? Thanks for your help,
> and I apologize if it is a very simple solution that I am missing.
>
> Sincerely
> Joshua Wolosz
>
> The full code is:
>
> <problem>
>
> <parameter name="ordered" id="13" type="string_yesno" default="no"
> description="Show Parts One-at-a-Time" />
>
> <script type="loncapa/perl">
> # Get the entered answer. First argument is partID, second is responseID
> $given=&submission(1,11);
> $example='You chose '.$given.' m';
> $given2=&submission(3,4);
> $example2='You chose '.$given2.' m';
> $a1=100*&abs($given2-$given)/$given2;
> </script>
>
> <part id="1">
> <startouttext />
> <i><b>Note:</b> You do not need to include the units when you input your
> calculations.</i><br></br>
>
> What did you estimate the width of the object to be?
> <endouttext />
> <customresponse answerdisplay="$example" id="11">
> <answer type="loncapa/perl"># We do not want a vector
> if ($submission=~/\,/) { return 'EXTRA_ANSWER'; }
> # No units needed
> if ($submission=~/^\d+\s+\w+$/) { return 'UNIT_NOTNEEDED'; }
> # Need a numerical answer here
> if ($submission!~/^[\d\.]+$/) { return 'WANTED_NUMERIC'; }
> { return 'EXACT_ANS'; }</answer>
> <textline readonly="no" />
> </customresponse><startouttext />meters<endouttext />
> </part>
>
> <part id="3">
> <startouttext />
> What did you <u>measure</u> the width of the object to be?
> <endouttext />
> <customresponse answerdisplay="$example2" id="4">
> <answer type="loncapa/perl"># We do not want a vector
> if ($submission=~/\,/) { return 'EXTRA_ANSWER'; }
> # No units needed
> if ($submission=~/^\d+\s+\w+$/) { return 'UNIT_NOTNEEDED'; }
> # Need a numerical answer here
> if ($submission!~/^[\d\.]+$/) { return 'WANTED_NUMERIC'; }
> { return 'EXACT_ANS'; }</answer>
> <textline readonly="no" />
> </customresponse><startouttext />meters<endouttext />
> </part>
>
> <part id="5">
> <startouttext />
> What was your percent error for the width?
> <endouttext />
> <numericalresponse answer="$a1" id="194">
> <responseparam name="tol" type="tolerance" default="0.5%"
> description="Numerical Tolerance" />
> <textline readonly="no" />
> </numericalresponse>
> </part>
> </problem
>
>
>
>
> When writing or responding, please remember that the Secretary of the
> Commonwealth of Massachusetts has determined that email is a public record.
>
> This communication may contain privileged or other confidential information.
> If you are not the intended recipient, or believe that you have received this
> communication in error, please do not print, copy, retransmit, disseminate,
> or otherwise use the information. Also, please indicate to the sender that
> you have received this email in error, and delete the copy you received.
> Thank you for your cooperation.
>
>
> _______________________________________________
> LON-CAPA-users mailing list
> LON-CAPA-users@mail.lon-capa.org
> http://mail.lon-capa.org/mailman/listinfo/lon-capa-users
_______________________________________________
LON-CAPA-users mailing list
LON-CAPA-users@mail.lon-capa.org
http://mail.lon-capa.org/mailman/listinfo/lon-capa-users
