[LON-CAPA-dev] formularesponse with maxima: Addition issues?

[Gerd Kortemeyer]

Hi,

Yes, there was a rather stupid bug. You can change lonmaxima.pm by  
hand for now (see the diff below):

   Modified files:
     /loncom/homework	lonmaxima.pm
   Log:
   - need parentheses


Index: loncom/homework/lonmaxima.pm
diff -u loncom/homework/lonmaxima.pm:1.15 loncom/homework/ 
lonmaxima.pm:1.16
--- loncom/homework/lonmaxima.pm:1.15	Tue May 29 16:56:39 2007
+++ loncom/homework/lonmaxima.pm	Fri Jun 15 17:49:50 2007
@@ -1,7 +1,7 @@
  # The LearningOnline Network with CAPA
  # Interface routines to MAXIMA CAS
  #
-# $Id: lonmaxima.pm,v 1.15 2007/05/29 20:56:39 albertel Exp $
+# $Id: lonmaxima.pm,v 1.16 2007/06/15 21:49:50 albertel Exp $
  #
  # Copyright Michigan State University Board of Trustees
  #
@@ -121,7 +121,7 @@

  sub compareterms {
      my ($socket,$terma,$termb)=@_;
-    my $difference=$terma.'-'.$termb;
+    my $difference=$terma.'-('.$termb.')';
      if (&blacklisted($difference)) { return 'Error: blacklisted'; }
      my $reply=&maximareply($socket,'trigsimp(trigreduce('. 
$difference.'));');
      if ($reply=~/^\s*0\s*$/) { return 'true'; }


- Gerd.

On Jun 20, 2007, at 7:08 AM, Stefan Bisitz wrote:

> Hi,
>
> Before starting a new bugreport, I'd like to ask if someone knows any
> issues with formularesponse with maxima using addition?!?
>
> It seems that LON-CAPA/Maxima doesn't accept an answer which contains
> additions. For example, use the "Formula Response using Computer  
> Algebra
> System" template and add "+5" or "+x" to $derivative:
> --------
> <problem>
>     <script type="loncapa/perl">
> $k=&random(3,6,1);
> $formula="a*x^$k";
> $m=$k-1;
> $derivative="$k*a*x^$m+x"; # original: $derivative="$k*a*x^$m";
>     </script>
>     <startouttext />
> What is the derivative of <tt>$formula</tt> with respect to x?
>     <endouttext />
>     <formularesponse answer="$derivative">
>         <textline size="25" />
>     </formularesponse>
> </problem>
> --------
>
>> From now on, LON-CAPA displays "ERROR:Computer's answer is  
>> incorrect".
>
> Using mathresponse or formularesponse WITH sampling points, no  
> problems
> could be seen.
>
> Any idea what's wrong?
>
> Stefan Bisitz
>
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