[bug #68434] Function gsvd crashes when matrices have 10 or more columns

Ian Proudler <[email protected]> Tue, 16 Jun 2026 10:25:51 -0400 (EDT)

Newsgroups	gmane.comp.gnu.octave.bugs
Message-ID	<[email protected]>

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Follow-up Comment #18, bug #68434 (group octave):

I patched my version of 11.3.0 and ran some tests on random matrices. It all
looks good with one minor issue. 

From a Linear Algebra point of view C and S are supposed to have R columns
where R = rank([A;B]). In fact they have the same number of columns as A & B.
I can believe that this is not how OpenBLAS works since it would require a
determination of rank. I cannot find my way around the OpenBLAS documentation
so can't check.

One consequence of this is that C'*C + S'*S != eye(columns(A)) as stated in
the Octave documentation. There are some zeros appended if R < columns(A).



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