Hi David,
define 'ln(x):=log(x)'. (See my example below.)
The maxima function 'radcan' simplifies expressions in maxima, which
can contain logs, exponentials, and radicals, so it may helpful. (It is
not needed in your specific example but can help to compare more subtle
examples.
- Peter
<problem>
<script type="loncapa/perl">
our $result = "4*ln(1/2)";
</script>
<part id="p0">
<customresponse id="p0r0">
<textline />
<answer type="loncapa/perl">
my $given = implicit_multiplication($submission);
my $maxima_in = "ln(x):=log(x);is(rat(radcan($result-($given)))=0)";
my $evaluation = cas( 'maxima', $maxima_in );
return 'EXACT_ANS' if $evaluation eq 'true';
return 'INCORRECT' if $evaluation eq 'false';
return 'BAD_FORMULA';
</answer>
</customresponse>
</part>
</problem>
Am 06/17/2015 um 05:45 PM schrieb Huckleberry, David W:
4*(ln(1) - ln(2))
--
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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