[LON-CAPA-users] Preprocessor vs. Custom Response

Gerd Kortemeyer kortemey at msu.edu
Fri Dec 4 13:50:38 EST 2015


Are you actually looking for the fraction to be reduced? Because we can check that very generally.

- Gerd.

Gerd Kortemeyer

On Dec 4, 2015, at 1:16 PM, Jacob Bond <bond13 at purdue.edu> wrote:

>> If this is really a static answer format, then it should indeed be a stringresponse. Note that stringresponses also take >regular expressions, so you can do
>> /(2\.5)|(5\/2)/
>> to do “or” - you don’t need a preprocessor. LON-CAPA also has an explicit “or”, I think there’s a template for it. It >may be “or” for numerical, but you can replace numerical by string.
>> In general, for things that are numerical (and not “static” like the above), the main decision criterion for >preprocessor versus customresponse is whether you need the luxuries of numericalresponse:
>> * significant digits
>> * tolerances
>> * automated bubblesheet production
>> * easy printout of correct solution after answer date
>> If you can benefit from those luxuries, use numericalresponse and preprocessor. If not, or if those things are in the >way, use customresponse.
>> Sorry, I need to run for a meeting. Hope this helps,
>> - Gerd.
> It is not a static answer.  I was not aware of the regular expression option, this is promising and I think I could do either substitution ($frac =~ s/\//\\\//;) or split (@fracarray = split('/', $frac);) and concatenate strings into the desired regular expression.
> Also, I have attempted using an <answergroup> under a <stringresponse> and it just doesn't recognize it.
> Thank you!
> Jacob
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