[LON-CAPA-users] Understanding formularesponses

Mon, 8 Sep 2008 00:20:44 -0800

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Hi Ray,

If you want to allow a numerical approximation to log(2) as a correct
answer, then I recommend that you use point sampling rather than a computer
algebra system to evaluate the answer. Try this:

<problem>
<part><startouttext />Numerical Tolerance works well with formula response
when point sampling is used. Either log(2) or 0.6931 are graded
correct:<endouttext />

<formularesponse answer="log(2)" samples="x@1:5#4">
    <responseparam description="Numerical Tolerance" type="tolerance"
default="0.0001" name="tol" />
    <textline size="25" readonly="no" />

</formularesponse>
</part>

<part><startouttext />Numerical Tolerance does not seem to work well with
formula response when the expression is evaluated in Maxima. This time
log(2) is correct but 0.6931 is graded as incorrect:<endouttext />
<formularesponse answer="log(2)">
    <responseparam description="Numerical Tolerance" type="tolerance"
default="0.0001" name="tol" />
    <textline size="25" readonly="no" />

</formularesponse>
</part>
</problem>

Justin

On Sun, Sep 7, 2008 at 11:36 PM, Ray Batchelor <batchelo@sfu.ca> wrote:

>
> How would you create a formula response question for which you want both
> "log(2)" to be the answer both symbolically and numerically?
>
> --
> Ray
>
>

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Justin Gray
Dept. of Mathematics
Simon Fraser University
8888 University Drive
Burnaby, B.C. V5A 1S6
Canada
Tel. +1 778-782-4237
Fax. +1 778-782-4947
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

http://www.terryfoxrun.org/ENRunner/default.asp?s=1&RunnerID=56229

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<div dir="ltr">Hi Ray, If you want to allow a numerical approximation to log(2) as a correct answer, then I recommend that you use point sampling rather than a computer algebra system to evaluate the answer. Try this: 
 &lt;problem&gt; &lt;part&gt;&lt;startouttext /&gt;Numerical Tolerance works well with formula response when point sampling is used. Either log(2) or 0.6931 are graded correct:&lt;endouttext /&gt; &lt;formularesponse answer=&quot;log(2)&quot; samples=&quot;x@1:5#4&quot;&gt; 
&nbsp;&nbsp;&nbsp; &lt;responseparam description=&quot;Numerical Tolerance&quot; type=&quot;tolerance&quot; default=&quot;0.0001&quot; name=&quot;tol&quot; /&gt; &nbsp;&nbsp;&nbsp; &lt;textline size=&quot;25&quot; readonly=&quot;no&quot; /&gt; &nbsp;&nbsp;&nbsp; 
&lt;/formularesponse&gt; &lt;/part&gt; &lt;part&gt;&lt;startouttext /&gt;Numerical Tolerance does not seem to work well with formula response when the expression is evaluated in Maxima. This time log(2) is correct but 0.6931 is graded as incorrect:&lt;endouttext /&gt; 
&lt;formularesponse answer=&quot;log(2)&quot;&gt; &nbsp;&nbsp;&nbsp; &lt;responseparam description=&quot;Numerical Tolerance&quot; type=&quot;tolerance&quot; default=&quot;0.0001&quot; name=&quot;tol&quot; /&gt; &nbsp;&nbsp;&nbsp; &lt;textline size=&quot;25&quot; readonly=&quot;no&quot; /&gt; 
&nbsp;&nbsp;&nbsp; &lt;/formularesponse&gt; &lt;/part&gt; &lt;/problem&gt; Justin <div class="gmail_quote">On Sun, Sep 7, 2008 at 11:36 PM, Ray Batchelor &lt;<a href="mailto:batchelo@sfu.ca">batchelo@sfu.ca</a>&gt; wrote: 
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div dir="ltr"> How would you create a formula response question for which you want both 
&quot;log(2)&quot; to be the answer both symbolically and numerically? -- Ray 
</div>
</blockquote></div> -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Justin Gray &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Dept. of Mathematics &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
Simon Fraser University 8888 University Drive Burnaby, B.C. V5A 1S6 Canada Tel. +1 778-782-4237 Fax. +1 778-782-4947 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ <a href="http://www.terryfoxrun.org/ENRunner/default.asp?s=1&amp;RunnerID=56229">http://www.terryfoxrun.org/ENRunner/default.asp?s=1&amp;RunnerID=56229</a> 
 
</div>

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