#10795: Fix and upgrade double dense matrix QR decomposition
-------------------------------+--------------------------------------------
Reporter: rbeezer | Owner: jason, was
Type: defect | Status: new
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: closed => new
* resolution: fixed =>
* merged: sage-4.8.alpha5 =>
Comment:
This sometimes gives a doctest failure:
{{{
sage -t -long -force_lib devel/sage/sage/matrix/matrix_double_dense.pyx
**********************************************************************
File
"/mnt/usb1/scratch/buildbot/sage/sage-1/sage_binary/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 -0.631992 -0.383955]
[ 0.179605 -0.144591 -0.6643 0.711014]
[ 0.179605 -0.70488 -0.39705 -0.559676]
[ 0.898027 0.397625 -0.040527 -0.183849]
**********************************************************************
}}}
It's not clear why it happens. Because on the same machine I have one
Sage build where it works, one where it doesn't with the exact same
source, but different gcc version.
Does this code use any external libraries (ATLAS comes to mind)?
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10795#comment:14>
Sage <http://www.sagemath.org>
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