[LON-CAPA-users] catching maxima errors

[Stefan Bisitz]

Hi,

Does the error occur in Construction Space or within a course?

Anyway, I don't see an ISE - neither in CSTR nor in a course using your 
problem file on a testing server.

Stefan Bisitz


Am 26.11.2012 17:58 schrieb Gerd Kortemeyer:
> Hi,
>
> Weird, I copied and pasted your code, and it works for me without bombs, even if I input "x)". I can get it to do right, wrong, and "unable to understand formula."
>
> Did you "Reset Submissions" and "New Randomization," to make sure all caches are cleared from possibly wrong edits in the past?
>
> Just for testing, can you change the last line to
>
>      return 'INCORRECT';
>
> and see if it still bombs for "x)"?
>
> Unless MAXIMA is not really running (or running in German, or something), I cannot see how this happens. Works for me …
>
> - Gerd.
>
>
> On Nov 26, 2012, at 11:41 AM, Peter Dencker <dencker at math.uni-luebeck.de> wrote:
>
>> Hi Gerd,
>>
>> below I give a simple example. The input of 'x)' (an example, the
>> parentheses are not balanced) causes the 'Internal error ...'.
>>
>> Thanks.
>>
>> - Peter
>>
>>
>> <problem>
>>
>> <script type="loncapa/perl">
>>   $result = 'x';
>> </script>
>>
>> <startouttext />
>>   Type a maxima formula equivalent to 'x'.
>> <endouttext />
>>
>> <customresponse id="p0r0">
>>
>>   <answer type="loncapa/perl">
>>     $bool = &cas('maxima',"is(ratexpand($submission = $result))") ;
>>     if ( $bool eq 'true') {return  'EXACT_ANS';};
>>     if ( $bool eq 'false') {return  'INCORRECT';};
>>     return 'BAD_FORMULA';
>>   </answer>
>>
>> <startouttext />
>>    <br /> <textline readonly="no" />  <br />
>> <endouttext />
>>
>> </customresponse>
>>
>> </problem>
>>
>>
>>
>>
>> Gerd Kortemeyer schrieb:
>>> Hi,
>>>
>>> On Nov 26, 2012, at 10:00 AM, Peter Dencker <dencker at math.uni-luebeck.de> wrote:
>>>>
>>>> executing a syntactically incorrect answer with maxima using
>>>> customresponse causes a crash remark 'Internal error ...' and  a  'bomb'
>>>> in the construction space of the author. In comparison, mathresponse
>>>> returns 'BAD_FORMULA'.
>>>
>>> Something else must be wrong inside <customresponse>. A call to &cas() inside <customresponse> will always just return whatever the last output of MAXIMA was, which is either the result or a MAXIMA error message; no possibility of an internal error, unless there is an error inside the surrounding Perl code or an invalid value is returned from <customresponse> answer script.
>>>
>>> - Gerd.
>>>
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>>
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