Hi Jacob, Yuk, Carl, I am going to have to spend some time learning more about Maxima, but what you have given me will help me start moving in the right direction. Thanks!
Best regards, Gene L. Harding, PE Associate Professor of ECET 574-520-4190 From: lon-capa-users-boun...@mail.lon-capa.org [mailto:lon-capa-users-boun...@mail.lon-capa.org] On Behalf Of Jacob Bond Sent: Tuesday, February 13, 2018 1:51 PM To: Discussion list for LON-CAPA users <lon-capa-users@mail.lon-capa.org> Subject: [LON-CAPA-users] {Disarmed} Re: {Disarmed} RE: Matrix Operations Hi all, Given an array @mat of matrix entries, this will build the Maxima syntax for the $rows x $cols matrix with entries @mat: my $maxima_mat = 'matrix('; my @mat_copy = @mat; for my $i (0..$rows-1) { my @row = splice(@mat_copy, 0, $cols); $maxima_mat .= '['.join(',', @row).']'; if ($i != $rows-1) {$maxima_mat .= ',';} } $maxima_mat .= ')'; Then you can invert it and break it back into an array like this: my $inv = cas('maxima', "list_matrix_entries(invert($maxima_mat));"); $inv =~ s/\[|\]//g; #remove the leading and trailing [] my @mat_inv = split(',', $inv); I suppose it's not the prettiest, but it's certainly shorter than Perl functions for all of the matrix operations. You could even wrap the code into Perl functions matrix_to_maxima and matrix_from_maxima. You could also write similar functions if you are using a Perl "matrix" (https://perlmaven.com/multi-dimensional-arrays-in-perl<https://secure-web.cisco.com/1ovdfYe-tuT292ryIaY_hIwMmgvYAUJf0f_mBR3JHYuhs8KpquoITY5btMA5FerhDihthb2xaG3vAgcRrIqfC-hTiUSWRa0s6fSGMXPNfXJbJGjHp8bFFnLg9pDEemnaa9X-sWs4ERqLUUGRRHprdonLazR0XPTW2KpZ0iOwN9I2eR-SgL1FkjGhp-mqmFCZs4pjhzzg8gjG1kL28l2EzVrDsMJXKpdZpJWG_htKWbQqhWXYXKEoOkbesRQi1grndsfSDCC1BUqIfMr3xvmGTQay9DzOwuSEkbuqHLoj3HLjvxZ9RyOLHhp7vVsaCIGfO56tDwNQUaYBjtw0T5dXbmmULd57Zgis4_K_Dn-cBaMY/https%3A%2F%2Fperlmaven.com%2Fmulti-dimensional-arrays-in-perl>) instead of a flat array. Best, Jacob ________________________________ From: lon-capa-users-boun...@mail.lon-capa.org<mailto:lon-capa-users-boun...@mail.lon-capa.org> <lon-capa-users-boun...@mail.lon-capa.org<mailto:lon-capa-users-boun...@mail.lon-capa.org>> on behalf of Liu, Yuk Tung <yt...@illinois.edu<mailto:yt...@illinois.edu>> Sent: Tuesday, February 13, 2018 12:08:23 PM To: Discussion list for LON-CAPA users Subject: [LON-CAPA-users] {Disarmed} RE: Matrix Operations 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<mailto: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. MailScanner has detected definite fraud in the website at "urldefense.proofpoint.com". Do not trust this website: MailScanner has detected definite fraud in the website at "urldefense.proofpoint.com". Do not trust this website: 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 MailScanner has detected definite fraud in the website at "urldefense.proofpoint.com". Do not trust this website: MailScanner has detected definite fraud in the website at "urldefense.proofpoint.com". Do not trust this website: 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=> MailScanner has detected definite fraud in the website at "urldefense.proofpoint.com". Do not trust this website: MailScanner has detected definite fraud in the website at "urldefense.proofpoint.com". Do not trust this website: 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> [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<mailto: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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