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<div>Hi</div>
<div> Sure. </div>
<div>Dad</div>
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Sent from my iPhone</div>
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On Jun 1, 2015, at 4:37 PM, Bob Gonzales <<a href="mailto:rgonzal@binghamton.edu">rgonzal@binghamton.edu</a>> wrote:<br>
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<div>So, I got another one today. If you look at 'Script Vars' for partB, an answer was actually calculated for the part. Here's a cut and paste from the 'Script Vars' windows while viewing the message:</div>
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<div>$ansa=9.54889173779562e+16<br>
$ansb=1.90977834755912e+17<br>
$deg2rad=0.0174532925199433<br>
$f1=6.0221e+23<br>
$f2=2<br>
$mw1=296.41<br>
$n1=0.047<br>
$pi=3.14159265358979<br>
$rad2deg=57.2957795130823<br>
$sub2=oxygen<br>
$t1=2<br>
$t2=3<br>
$unit1=molecules<br>
$uselessVariable=partB</div>
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<div>$ansb is the answer for this part, $f1 is the variable in the denominator that lon-capa is referring to in the message:</div>
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Illegal division by zero at (eval 88895) line 6.<br>
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occurred while running<br>
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$t2=&random(1,3);<br>
$sub2=&choose($t2,"carbon","hydrogen","oxygen");<br>
$f2=&choose($t2,20.0,24.0,2.0);<br>
$uselessVariable="partB";<br>
$ansb=($ansa/$f1)* $f2 * 6.0221e23;<br>
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This error occurred while processing part t06p12b<br>
The error occurred on host binghamtona7
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<div>So, I don't know how lon-capa calculated the answer and then complained about an illegal divide by zero.</div>
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<div>Any thoughts?</div>
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<div>Bob Gonzales<br>
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<div class="gmail_quote">On Fri, May 29, 2015 at 4:37 PM, Bob Gonzales <span dir="ltr">
<<a href="mailto:rgonzal@binghamton.edu" target="_blank">rgonzal@binghamton.edu</a>></span> wrote:<br>
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<div dir="ltr">- The servers are all in the binghamton domain: <a href="http://loncapa3.chem.binghamton.edu" target="_blank">loncapa3.chem.binghamton.edu</a>, loncapa5,<a href="http://chem.binghamton.edu" target="_blank">chem.binghamton.edu</a>,
<a href="http://loncapa7.chem.binghamton.edu" target="_blank">loncapa7.chem.binghamton.edu</a>. The machines are not identical machines. I believe they are 7, 5, 2 years old respectively. They all have 8 GB or better of memory. They are all Xenons with
multiple cores. They are all running Centos 5.11 and Loncapa 2.10.1.
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<div>- This is occurred for 3 students, 2 other students have gotten it correct. Many others haven't tried it yet. <br>
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<div>- We've used this problem before and haven't gotten bombs before. But, of course, there have been many Centos updates applied since we used it last summer.</div>
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<div>- Setting all the variables in partA would take care of it but I've always done it this way to cut down on the scrolling up and down when creating/editing problems. </div>
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<div>- Clicking 'Script Vars' while viewing the message does show the variable with a value. </div>
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<div>- I set a useless variable in the first part and changed it's value in the second part per Damien's suggestion, we will see what happens. <br>
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<div>Thanks for all the feedback. I will keep you posted.</div>
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<div>Bob</div>
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