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 <lon-capa-users@mail.lon-capa.org> 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 <lon-capa-users-boun...@mail.lon-capa.org> On Behalf Of Harding, Gene L Sent: Thursday, March 26, 2020 2:53 PM To: Discussion list for LON-CAPA users <lon-capa-users@mail.lon-capa.org> 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 <lon-capa-users-boun...@mail.lon-capa.org> On Behalf Of Harding, Gene L Sent: Thursday, March 26, 2020 2:41 PM To: Discussion list for LON-CAPA users <lon-capa-users@mail.lon-capa.org> 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: <answer type="loncapa/perl"> $total_score = 0; # These submission variables appear to be local to this perl script section only. ($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); </answer> 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 <lon-capa-users-boun...@mail.lon-capa.org> On Behalf Of Lucas, Mark Sent: Thursday, March 26, 2020 2:18 PM To: Discussion list for LON-CAPA users <lon-capa-users@mail.lon-capa.org> 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 <glhar...@purdue.edu> 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? > > Best regards, > > Gene L. Harding, PE > Associate Professor of ECET > Purdue University > 574-520-4190 > https://polytechnic.purdue.edu/south-bend/ > > _______________________________________________ > LON-CAPA-users mailing list > LON-CAPA-users@mail.lon-capa.org > https://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmail. > lon-capa.org%2Fmailman%2Flistinfo%2Flon-capa-users&data=02%7C01%7C > lucasm%40ohio.edu%7Ce9661e81abe94f8dee6a08d7d1b1a400%7Cf3308007477c4a7 > 0888934611817c55a%7C0%7C0%7C637208433204394095&sdata=pc8Q9TIuMr9Jn > d6QU5ew62C9XjFU7XKCzY%2BcXlc40Mg%3D&reserved=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 _______________________________________________ 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 _______________________________________________ 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
