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
denc...@math.uni-luebeck.de
www.math.uni-luebeck.de
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