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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Justin,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Many thanks!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">I will give it a try!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Grigory<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><b>From:</b> LON-CAPA-users <lon-capa-users-bounces@mail.lon-capa.org>
<b>On Behalf Of </b>Justin Gray<br>
<b>Sent:</b> Thursday, November 21, 2019 2:28 PM<br>
<b>To:</b> Discussion list for LON-CAPA users <lon-capa-users@mail.lon-capa.org><br>
<b>Subject:</b> Re: [LON-CAPA-users] Formula response won't recognize "pi"<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">You can evaluate the answer using Maxima and allow for a tolerance using mathresponse. In Maxima, the constant pi is written as %pi. Here is a possible coding for this problem, which will accept either %pi or a numerical approximation for
pi:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><problem><br>
<script type="loncapa/perl"><br>
$function = "1/sqrt(4*(%pi)^2*L*C)";<br>
$answer=&xmlparse('The correct answer is <m eval="on">$\frac{1}{\sqrt{4\cdot\pi^{2} \cdot L\cdot C}}$</m>');<br>
</script><br>
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<startouttext /><br>
<p>Enter <m>$ \frac{1}{\sqrt{4\cdot\pi^{2} \cdot L\cdot C}} $</m></p><br>
<endouttext /><br>
<br>
<mathresponse answerdisplay="$answer" cas="maxima" args="$function"><br>
<answer>is(abs((RESPONSE[1])/(LONCAPALIST[1]) - 1) < 0.01);</answer><br>
<textline readonly="no" size="100" spellcheck="none" /><br>
</mathresponse><br>
</problem><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">You will probably want to give students some instruction for formatting their answer.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Best,<o:p></o:p></p>
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<p class="MsoNormal">Justin<br clear="all">
<o:p></o:p></p>
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<p style="line-height:13.5pt"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">--<b><o:p></o:p></b></span></p>
<p style="line-height:13.5pt;margin:1rem 0px 1.5rem;font-stretch:normal"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">Justin Gray</span></b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black"><br>
Senior Lecturer | Department of Mathematics<br>
Simon Fraser University | SCK 10531<br>
8888 University Dr., Burnaby, B.C. V5A 1S6<br>
T: 778.782.4237<o:p></o:p></span></p>
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<h3><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:black;font-weight:normal"><img id="_x0000_i1025" src="https://www.sfu.ca/content/sfu/communicators-toolkit/tools/brand-tools/on-brand-templates/email-signature/jcr:content/main_content/image_0.img.1280.high.png/1527873607206.png"><o:p></o:p></span></h3>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Thu, Nov 21, 2019 at 11:14 AM H. K. Ng <<a href="mailto:hkng@fsu.edu">hkng@fsu.edu</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hi,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Formularesponse using cas with maxima works great. <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><problem><br>
<script type="loncapa/perl"><br>
$ansa = &cas('maxima','1/sqrt(4*pi^2*L*C)');<br>
</script><br>
<br>
<startouttext />What is formula for resonant frequency for an LC circuit? <endouttext /><br /><br>
<br>
<startouttext /><m>$ \omega_{res} = $</m><endouttext /><br>
<formularesponse answer="$ansa" id="12"><br>
<textline readonly="no" /><br>
</formularesponse><br>
<br>
</problem><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Regards,<o:p></o:p></p>
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<p class="MsoNormal">-hk<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Thu, Nov 21, 2019 at 11:05 AM SIMIN, GRIGORY <<a href="mailto:SIMIN@engr.sc.edu" target="_blank">SIMIN@engr.sc.edu</a>> wrote:<o:p></o:p></p>
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<p>Hi all!<o:p></o:p></p>
<p><span style="color:black">I've found a strange issue in some problems requiring formula response.</span><o:p></o:p></p>
<p><span style="color:black">I have a simple question to enter the formula for the resonant frequency.</span><o:p></o:p></p>
<p><span style="color:black">An example of correct answer is (in other variations the formula could be a bit more complex than this one)</span><o:p></o:p></p>
<p><span style="color:black">1/(2*pi*sqrt(L*C))</span><o:p></o:p></p>
<p><span style="color:black">The correct solution is checked by sampling L and C values.</span><o:p></o:p></p>
<p><span style="color:black">When I am entering the answer, I can see that LON-CAPA recognizes it because it displays the formatted formula as I am entering it:</span><o:p></o:p></p>
<p><span style="color:black"><img border="0" width="429" height="119" style="width:4.4666in;height:1.2416in" id="gmail-m_-3309117221527511361gmail-m_-4797884704070664240Picture_x0020_1" src="cid:image001.jpg@01D5A07B.3EF6C940"></span><o:p></o:p></p>
<p><span style="color:black"> </span><o:p></o:p></p>
<p><span style="color:black">But when I press submit, I got the response:</span><o:p></o:p></p>
<p><span style="color:black">“unable to understand formula”</span><o:p></o:p></p>
<p><span style="color:black"> </span><o:p></o:p></p>
<p><span style="color:black">By experimenting with this, I found that the issue happens because of “pi” being a part of the answer.</span><o:p></o:p></p>
<p><span style="color:black">If pi is replaced with 3.141, everything would work.</span><o:p></o:p></p>
<p><span style="color:black">But it feels weird asking students to enter 3.141 instead of pi; besides, I don’t even want to give them a hint that pi is a part of the answer.
</span><o:p></o:p></p>
<p><span style="color:black"> </span><o:p></o:p></p>
<p><span style="color:black">Why is this happening? Apparently LON-CAPA knows what “pi” means because it displays it correctly.</span><o:p></o:p></p>
<p><span style="color:black"> </span><o:p></o:p></p>
<p><span style="color:black">Thanks!</span><o:p></o:p></p>
<p><span style="color:black">Grigory</span><o:p></o:p></p>
<p><span style="color:black"> </span><o:p></o:p></p>
<p><span style="color:black"> </span><o:p></o:p></p>
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