#10802: Singular values of matrices over CDF
-------------------------------+--------------------------------------------
Reporter: rbeezer | Owner: jason, was
Type: enhancement | Status: needs_review
Priority: minor | Milestone: sage-4.7.2
Component: linear algebra | Resolution:
Keywords: | Work_issues:
Upstream: N/A | Reviewer: Martin Raum
Author: Rob Beezer | Merged:
Dependencies: #10837 |
-------------------------------+--------------------------------------------
Changes (by rbeezer):
* status: needs_work => needs_review
Old description:
> This method serves two purposes:
>
> (a) a convenience for getting singular values and clipping small values
> to zero.
>
> (b) a starting point for reasonable quality control on numerical
> approximations from CDF matrices. This will make a rank computation easy
> (though not fool-proof) and this can be used in other situations as a
> consistency check. See #7392.
> ----
> '''Depends:'''
> 1. #10837
>
> '''Apply:'''
> 1. [attachment:trac_10802-singular-values-CDF-v2.patch]
> 2. [attachment:trac-10802-singular-values-CDF-review-v2.patch]
New description:
This method serves two purposes:
(a) a convenience for getting singular values and clipping small values to
zero.
(b) a starting point for reasonable quality control on numerical
approximations from CDF matrices. This will make a rank computation easy
(though not fool-proof) and this can be used in other situations as a
consistency check. See #7392.
----
'''Depends:'''
1. #10837
'''Apply:'''
1. [attachment:trac_10802-singular-values-CDF-v3.patch]
2. [attachment:trac-10802-singular-values-CDF-review-v2.patch]
3. [attachment:trac_10802-doctest-noise.patch]
--
Comment:
4.7.2.alpha1 + #10837
"v3" is a very trivial rebase for fuzzieness.
Two doctests now fail (did ATLAS change?). "doctest-noise" patch
brutally makes these failures go away, but will necessitate a review.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10802#comment:18>
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