#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):
Karl - glad to see you found a machine to experiment with!
Jason - I'm following the discussion on the numpy list as well. Nice
work.
Question: do we understand why this problem does not surface on new Macs,
or on Linux? Also, the evidence prior seems to indicate that the problem
occurs with more rows than columns, but just when the number of rows is
only slightly bigger than the number of columns. Maybe it is just a
question of a guarantee - the returned V ''could'' be unitary, but is not
claimed to be.
Thanks for the detective work on this one.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11248#comment:28>
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