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<p class="MsoNormal"><span style="font-size:11.0pt">Thanks Ray. That's an interesting twist putting in zeros!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">For now what I'm doing sounds a bit similar to your solution of having undesirable components disappear. Pending a possible(?) preprocessing solution, I'm using JavaScript to insert exponents or co-efficients
of 1 where the students have chosen to leave the blank when the problem is submitted and then remove them again as the page reloads. Once the student has the answer correct, I'm hiding the exponents or coefficients that are equal to one from the correct answer.
This seems to work in my testing -- we'll turn it loose for a horde of students to work with next week and see how it stands up to that.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Great to hear from you, Ray!<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;color:black">Doug<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;color:black">Douglas Mills<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;color:black">Director of Instructional Technology<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;color:black">Department of Chemistry<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;color:black">University of Illinois<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="color:black">From: </span>
</b><span style="color:black"><lon-capa-users-bounces@mail.lon-capa.org> on behalf of Raymond Batchelor <batchelo@sfu.ca><br>
<b>Reply-To: </b>"batchelo@sfu.ca" <batchelo@sfu.ca>, Discussion list for LON-CAPA users <lon-capa-users@mail.lon-capa.org><br>
<b>Date: </b>Thursday, November 10, 2016 at 12:19 PM<br>
<b>To: </b>Discussion list for LON-CAPA users <lon-capa-users@mail.lon-capa.org><br>
<b>Subject: </b>Re: [LON-CAPA-users] Making something out of nothing with preprocessing?<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><b><span style="font-family:Helvetica;color:black">From:
</span></b><span style="font-family:Helvetica;color:black">"Douglas G Mills" <dmills@illinois.edu><br>
<b>To: </b>lon-capa-users@mail.lon-capa.org<br>
<b>Cc: </b>"Douglas G Mills" <dmills@illinois.edu><br>
<b>Sent: </b>Wednesday, 9 November, 2016 11:45:55<br>
<b>Subject: </b>[LON-CAPA-users] Making something out of nothing with preprocessing?<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:Helvetica;color:black">Hi Doug,<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:Helvetica;color:black"> Similarly the coefficent could be "0" (H2O, H+, or OH- for example -- when you want them to decide on which side the equation those would or would not appear).<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:Helvetica;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:Helvetica;color:black">Several years back, I made resources where students were still required to enter "0" or "1" coeffs, when appropriate.<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:Helvetica;color:black">However, I put in conditions that hide the affected parts of the equation so that, once they have answered the question correctly, some species no longer appear and
coeffients of "1" have been removed.<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:Helvetica;color:black">Not quite a solution but, this has worked fine for several years. There remains the issue that, once they have it correct, grader can no longer locate or view the
suppressed species nor the "0" and "1" coefficients as entered by the student.<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:Helvetica;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:Helvetica;color:black">lol<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:Helvetica;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:Helvetica;color:black">Ray<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:Helvetica;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:Helvetica;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;color:black">Hi All,</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;color:black">There are times, such as filling in coefficients to balance a chemical equation, when the best answer would be no answer at all. Requiring students to put 1 as the coefficient
of O2 in the reaction </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;color:black">"2H2 + O2 -> 2H2O"</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;color:black">when they are presented with [numericalresponse]H2 + [numericalresponse]O2 -> [numericalresponse]H2O because if they don't Lon-Capa will not process the answer because
"not all answers were submitted" is an artificial concession to the LMS that I'd like to avoid. I had thought maybe with preprocessing I could instruct students to leave a text field blank -- as such an equation would normally be written -- when the coefficient
is 1 and then preprocess and insert a 1 for the case where the textfield is empty so that Lon-Capa is getting an answer without the artificial exercise of the student putting in a coefficient of 1, but that does not seem to be working. Should that be possible
and I'm just going about it the wrong way? Any other ideas on how to address this besides instructing students to give 1 as the answer?</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt;color:black">Thanks!</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.5pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.5pt;color:black">Doug</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.5pt;color:black"> </span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.5pt;color:black">Douglas Mills</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.5pt;color:black">Director of Instructional Technology</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.5pt;color:black">Department of Chemistry</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:10.5pt;color:black">University of Illinois</span><span style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="color:black"> <o:p></o:p></span></p>
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_______________________________________________<br>
LON-CAPA-users mailing list<br>
LON-CAPA-users@mail.lon-capa.org<br>
http://mail.lon-capa.org/mailman/listinfo/lon-capa-users<o:p></o:p></span></p>
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<span style="font-family:"Times New Roman";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Times New Roman";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Times New Roman";color:black">--
<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Times New Roman";color:black">Raymond J. Batchelor, PhD.<br>
Department of Chemistry<br>
Simon Fraser University<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Times New Roman";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Times New Roman";color:black">Phone: 778-782-5635<o:p></o:p></span></p>
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