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:
$ansa=9.54889173779562e+16 $ansb=1.90977834755912e+17 $deg2rad=0.0174532925199433 $f1=6.0221e+23 $f2=2 $mw1=296.41 $n1=0.047 $pi=3.14159265358979 $rad2deg=57.2957795130823 $sub2=oxygen $t1=2 $t2=3 $unit1=molecules $uselessVariable=partB $ansb is the answer for this part, $f1 is the variable in the denominator that lon-capa is referring to in the message: Illegal division by zero at (eval 88895) line 6. occurred while running $t2=&random(1,3); $sub2=&choose($t2,"carbon","hydrogen","oxygen"); $f2=&choose($t2,20.0,24.0,2.0); $uselessVariable="partB"; $ansb=($ansa/$f1)* $f2 * 6.0221e23; This error occurred while processing part t06p12b The error occurred on host binghamtona7 So, I don't know how lon-capa calculated the answer and then complained about an illegal divide by zero. Any thoughts? Bob Gonzales On Fri, May 29, 2015 at 4:37 PM, Bob Gonzales <rgon...@binghamton.edu> wrote: > - The servers are all in the binghamton domain: > loncapa3.chem.binghamton.edu, loncapa5,chem.binghamton.edu, > loncapa7.chem.binghamton.edu. 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. > > - This is occurred for 3 students, 2 other students have gotten it > correct. Many others haven't tried it yet. > > - 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. > > - 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. > > - Clicking 'Script Vars' while viewing the message does show the variable > with a value. > > - 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. > > Thanks for all the feedback. I will keep you posted. > > Bob > >
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