Re: [GAP Forum] GAP to MATLAB?

[David Joyner]

On Wed, Oct 16, 2019, 8:06 AM Iverson, Joseph W [MATH] <j...@iastate.edu> wrote:

Dear GAP forum,

Does anybody know of a way to efficiently get matrices (say with cyclotomic entries) from GAP to MATLAB? For instance, is there a package to export matrices as .mat files?

Suggested reply:

One way to do this is to use GAP within SageMath, which has both a GAP interface and an Octave interface.

I have been getting by with a jerry-rigged solution where I make GAP print a matrix like
A:=[[1,0],[0,1]];;
to a file "A.m" containing a single string like
"A=[1,0;0,1];".
Then I have MATLAB read the file as a script. That works fine for small matrices, but for large ones (or for 3-tensors consisting of lots of matrices) it is prohibitively slow, both for GAP to print to the file and for MATLAB to interpret the result.

For a sense of scale, at the moment I would like to export 95040 matrices each of size 540x540 to MATLAB, preferably as a 3-tensor so that I can easily iterate through the list. (The matrices are the image of a representation of M12 having degree 540.)

Best regards,
Joey Iverson

Assistant Professor
Department of Mathematics
Iowa State University

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[David Joyner]

Ignore my post. It went to the wrong email list. Sorry.