[Octave-bug-tracker] [bug #49519] SparseComplexMatrix::solve numeric factorization

[Rik]

Update of bug #49519 (project octave):

              Item Group:          WTF, Matlab?!? => Matlab Compatibility   
                  Status:                    None => Confirmed              

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Follow-up Comment #5:

I received your files correctly and can reproduce the error.  From what I can
see this is related to a factorization call in UMFPACK.

I notice that your sparse matrix, if it were converted to a full matrix, would
have number of elements greater than the 32-bit index type used by Octave. 
This may be a problem.  Just for grins, I truncated the left-hand matrix to
46e3 x 46e3.  The left division operator now works.

So, one possibility is to compile Octave from source code and use the
'--enable-64' configure option which will use 64-bit indices (and you must be
running on 64-bit HW as well).  The issue is that you also need to re-build
all of your support libraries like BLAS and LAPACK to also use 64-bit indices.
 The instructions for building a 64-bit Octave are in the manual in Appendix
E.3 if you want to try.

Since you are a commercial enterprise, you might just want to pay someone to
resolve the situation.  The founder of Octave, John W. Eaton, does this kind
of work.  See https://www.gnu.org/software/octave/commercial-support.html.

I've saved the matrices in Octave's own binary format and by using lzip I have
reduced the file size to ~7.5 MB.  This still won't upload to this report so
I've asked on the Octave-Maintainer's list as to why this is not working.


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