Hi all, 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.
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. Yuk Tung Liu E-Learning Specialist Department of Statistics University of Illinois ________________________________ From: lon-capa-users-boun...@mail.lon-capa.org [lon-capa-users-boun...@mail.lon-capa.org] on behalf of Carl Lira [l...@egr.msu.edu] Sent: Tuesday, February 13, 2018 8:55 AM To: 'Discussion list for LON-CAPA users' Subject: Re: [LON-CAPA-users] Matrix Operations Hi Gene, I would take advantage of this also. I see some matrix operations available, but I don’t know if the module is installed. http://search.cpan.org/~ulpfr/Math-Matrix-0.8/Matrix.pm<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=> Carl Lira Associate Professor Department of Chemical Engineering and Materials Science 2100 Engineering Building 428 S. Shaw Lane Michigan State University East Lansing, MI 48824-1226 Phone: (517) 355-9731 FAX: (517)432-1105 http://www.egr.msu.edu/~lira<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=> http://chethermo.net<https://urldefense.proofpoint.com/v2/url?u=http-3A__chethermo.net_&d=DwMFAg&c=OCIEmEwdEq_aNlsP4fF3gFqSN-E3mlr2t9JcDdfOZag&r=xsNJH7BRV_oHPnc9R-Alu7kBOiq31bgHu5mdx82zpYk&m=cZ0DC2thsyaawbW-icbHvABJUkZREthPLmF_-JF0ZzM&s=x_KHS9fqXQB-CLliVp9AUzDgDobPkHAATbQeAdqpNOQ&e=> From: lon-capa-users-boun...@mail.lon-capa.org [mailto:lon-capa-users-boun...@mail.lon-capa.org] On Behalf Of Harding, Gene L Sent: Saturday, February 10, 2018 9:56 PM To: Discussion list for LON-CAPA users <lon-capa-users@mail.lon-capa.org> Subject: [LON-CAPA-users] Matrix Operations Hi, Does LON-CAPA have any provision for doing matrix operations (e.g., multiplication, inverse calculation or equivalent of the MATLAB “\” operator)? Best regards, Gene L. Harding, PE Associate Professor of ECET 574-520-4190
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