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List:       lon-capa-users
Subject:    Re: [LON-CAPA-users] Code to accept multiple answers
From:       Peter Dencker <dencker () math ! uni-luebeck ! de>
Date:       2015-06-18 12:54:32
Message-ID: 5582BF88.90807 () math ! uni-luebeck ! de
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But it is not  completely equivalent to use
     $result = 4*ln(1/2);
   or
     $result = "4*ln(1/2)";

To compare in the latter case mathematical expressions the use of 
'(rat(radcan(...))' seems to be more appropriate here.


<problem>

<script type="loncapa/perl">
   our $result = "4*ln(1/2)";
</script>


<mathresponse answerdisplay="$result" cas="maxima" args="$result">
     <answer>
         ln(x):= log(x);
         is(rat(radcan(RESPONSE[1]-(LONCAPALIST[1])))=0);
     </answer>
     <textline readonly="no" size="50" />
</mathresponse>

</problem>


- Peter


Am 06/18/2015 um 02:23 AM schrieb Justin Gray:
> One could also do this using mathresponse with the same idea to define
> ln(x):=log(x)
>
> <problem>
>
> <script type="loncapa/perl">
> $answer=4*log(1/2);
> </script>
>
> <startouttext />
> <p>Enter an answer equivalent to <m>$4*\ln(1/2)$</m>.</p>
> <endouttext />
>
> <mathresponse answerdisplay="4*ln(1/2)" cas="maxima" args="$answer">
>      <answer>ln(x):= log(x);
> is ( trigsimp(trigreduce(RESPONSE[1] - LONCAPALIST[1])) < 0.000001
> );</answer>
>
>      <textline readonly="no" size="50" spellcheck="none" />
> </mathresponse>
> </problem>
>
> This accepts 4*ln(1/2), 4*log(1/2), 4*(ln(1) - ln(2)), ln(1/2^4), etc,...
> all as correct answers.
>
> This problem has no randomization, but could be modified. (In this case you
> may need to pass any random parameters to Maxima using an argument array.)
> What is it that you are asking students to calculate?
>
> Justin
>
>
> Justin Gray | Senior Lecturer
> Department of Mathematics | Simon Fraser University
> 8888 University Drive, Burnaby | V5A 1S6 | Canada
> Tel: +1 778.782.4237
>


-- 
Dr. Peter Dencker
     wissenschaftl. Mitarbeiter

UNIVERSITÄT ZU LÜBECK
     INSTITUT FÜR MATHEMATIK

     Ratzeburger Allee 160
     23562 Lübeck

     Tel +49 451 500 4254
     Fax +49 451 500 3373
     dencker@math.uni-luebeck.de

     www.math.uni-luebeck.de
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