#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 jason):
Replying to [comment:29 rbeezer]:
> A suggestion from the numpy-discussion list about installing Numpy on
OSX 10.5 to test. Maybe with a binary installer this is very easy to try?
>
> "If it is an Accelerate bug it got fixed on OS X 10.6. Below is the
> output with both current master and 1.5.1. It may be worth checking
> this on 10.5 with the binary Numpy installer from Sourceforge to make
> sure it's not the Sage build process causing this somehow."
>
> The output he mentions is a confirmation that everything is OK on OSX
10.6 (I believe).
I've been testing on OSX 10.6, and I also don't get a zero row from
calling zgesdd directly from C.
I don't think it's necessary to test numpy on 10.5. You've already tested
that lapack itself is returning a zero row, which is what we think the
problem is.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11248#comment:32>
Sage <http://www.sagemath.org>
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