#11248: SVD matrix decomposition may return a non-invertible "unitary" matrix
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Reporter: rbeezer | Owner: jason, was
Type: defect | Status: new
Priority: major | Milestone: sage-4.7
Component: linear algebra | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Comment(by rbeezer):
Replying to [comment:14 slabbe]:
> So, does this means it is beyond Sage? I mean, should a fix be made in
Sage or should it be done upstream?
Its beyond me, as in - its beyond my knowledge.
I do not think the true source of the error has been located. It is not
Sage library code. It appears in numpy, which wraps the LAPACK function
ZGESDD. But I do not understand the relationships between LAPACK, ATLAS
and BLAS, and especially on the Mac. Palmieri says ATLAS on the mac is
"system supplied." It still could be the Sage build that does something
wrong.
So somebody else is going to have to carry this one forward. Samuel has
some ideas.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11248#comment:16>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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