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Hi all,<br>
<br>
Lon Capa supports both Maxima and R. They can be used to do matrix operations. I can't find examples involving matrix, but you can go to https://loncapa.msu.edu/adm/help/Creating_Math_Response_Problems.hlp and http://www.lon-capa.org/documentation.html to
see examples of using Maxima and R. <br>
<br>
A couple years ago, I wanted to create problems involving regressions. I used R to do that, but it only worked if the data size was not too big. So I wrote my own perl functions to perform regressions. Regressions involve matrix inversion, which I used Cholesky
decomposition since the matrix I worked with is symmetric and positive-definite.<br>
<br>
Yuk Tung Liu<br>
E-Learning Specialist<br>
Department of Statistics<br>
University of Illinois<br>
<br>
<br>
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<div id="divRpF663938" style="direction: ltr;"><font size="2" face="Tahoma" color="#000000"><b>From:</b> lon-capa-users-bounces@mail.lon-capa.org [lon-capa-users-bounces@mail.lon-capa.org] on behalf of Carl Lira [lira@egr.msu.edu]<br>
<b>Sent:</b> Tuesday, February 13, 2018 8:55 AM<br>
<b>To:</b> 'Discussion list for LON-CAPA users'<br>
<b>Subject:</b> Re: [LON-CAPA-users] Matrix Operations<br>
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<p class="MsoNormal"><span style="color:#1F497D">Hi Gene,</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color:#1F497D">I would take advantage of this also. I see some matrix operations available, but I don’t know if the module is installed.</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color:#1F497D"><a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__search.cpan.org_-7Eulpfr_Math-2DMatrix-2D0.8_Matrix.pm&d=DwMFAg&c=OCIEmEwdEq_aNlsP4fF3gFqSN-E3mlr2t9JcDdfOZag&r=xsNJH7BRV_oHPnc9R-Alu7kBOiq31bgHu5mdx82zpYk&m=cZ0DC2thsyaawbW-icbHvABJUkZREthPLmF_-JF0ZzM&s=p5GS2YNIPFAqLdONRuXDul2HB4YVSlcLDsqyZRz3vDY&e=" target="_blank"><font color="red"><b>MailScanner has detected definite fraud in the website at "urldefense.proofpoint.com". Do <i>not</i> trust this website:</b></font> http://search.cpan.org/~ulpfr/Math-Matrix-0.8/Matrix.pm</a></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color:#1F497D">Carl Lira</span></p>
<p class="MsoNormal"><span style="color:#1F497D">Associate Professor<br>
Department of Chemical Engineering and Materials Science<br>
2100 Engineering Building</span><span style="color:#1F497D"><br>
</span><span style="color:#1F497D">428 S. Shaw Lane</span><span style="color:#1F497D"><br>
</span><span style="color:#1F497D">Michigan State University</span><span style="color:#1F497D"><br>
</span><span style="color:#1F497D">East Lansing, MI 48824-1226</span><span style="color:#1F497D"><br>
</span><span style="color:#1F497D">Phone: (517) 355-9731</span><span style="color:#1F497D"><br>
</span><span style="color:#1F497D">FAX: (517)432-1105</span><span style="color:#1F497D"><br>
</span><span style="color:#1F497D"><a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.egr.msu.edu_-7Elira&d=DwMFAg&c=OCIEmEwdEq_aNlsP4fF3gFqSN-E3mlr2t9JcDdfOZag&r=xsNJH7BRV_oHPnc9R-Alu7kBOiq31bgHu5mdx82zpYk&m=cZ0DC2thsyaawbW-icbHvABJUkZREthPLmF_-JF0ZzM&s=KgidnsKWCwkMXbk-KRSFP-SdawqedYPbXqeoqnxNC70&e=" target="_blank"><font color="red"><b>MailScanner has detected definite fraud in the website at "urldefense.proofpoint.com". Do <i>not</i> trust this website:</b></font> <span style="color:blue">http://www.egr.msu.edu/~lira</span></a><br>
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<p class="MsoNormal"><b>From:</b> lon-capa-users-bounces@mail.lon-capa.org [mailto:lon-capa-users-bounces@mail.lon-capa.org]
<b>On Behalf Of </b>Harding, Gene L<br>
<b>Sent:</b> Saturday, February 10, 2018 9:56 PM<br>
<b>To:</b> Discussion list for LON-CAPA users <lon-capa-users@mail.lon-capa.org><br>
<b>Subject:</b> [LON-CAPA-users] Matrix Operations</p>
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<p class="MsoNormal"> </p>
<p class="MsoNormal"><span style="color:#1F497D">Hi,</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color:#1F497D">Does LON-CAPA have any provision for doing matrix operations (e.g., multiplication, inverse calculation or equivalent of the MATLAB “\” operator)?</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color:#1F497D">Best regards,</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
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<p class="MsoNormal"><span style="color:black">Gene L. Harding, PE</span></p>
<p class="MsoNormal"><span style="color:black">Associate Professor of ECET</span></p>
<p class="MsoNormal"><span style="color:black">574-520-4190</span><span style="color:#1F497D"></span></p>
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