#10795: Fix and upgrade double dense matrix QR decomposition
-------------------------------+--------------------------------------------
Reporter: rbeezer | Owner: jason, was
Type: defect | Status: needs_review
Priority: minor | Milestone: sage-4.8
Component: linear algebra | Resolution:
Keywords: | Work_issues:
Upstream: N/A | Reviewer: Martin Raum
Author: Rob Beezer | Merged:
Dependencies: |
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Changes (by jdemeyer):
* status: new => needs_review
Comment:
On Fedora 15-64 (flavius):
{{{
sage -t -long -force_lib devel/sage/sage/matrix/matrix_double_dense.pyx
**********************************************************************
File
"/home/buildbot/build/sage/flavius-1/flavius_full/build/sage-4.8.alpha5/devel
/sage-main/sage/matrix/matrix_double_dense.pyx", line 2243:
sage: Q.round(6).zero_at(10^-6)
Expected:
[-0.359211 0.569326 0.368048 0.641386]
[ 0.179605 -0.144591 0.925041 -0.301885]
[ 0.179605 -0.70488 0.077462 0.681825]
[ 0.898027 0.397625 -0.053281 0.180566]
Got:
[-0.359211 0.569326 0.616029 0.409077]
[ 0.179605 -0.144591 0.692375 -0.683705]
[ 0.179605 -0.70488 0.374205 0.575201]
[ 0.898027 0.397625 0.033095 0.185331]
**********************************************************************
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10795#comment:15>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
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