Since Trac is currently down, I send you an email instead:
It seems that #10795 (QR decomposition) causes failures in a
non-reproducible way. Is there some randomness in the algorithm?
For example, I just got this failure on sage.math.washington.edu (a
machine on which I remember the test succeeding):
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-4.7.2.alpha2/devel/sage-main/sage/matrix/matrix_double_dense.pyx",
line 1766:
sage: Q
Expected:
[ -0.359210604054 0.569326179705 0.368048420509 0.641385845805]
[ 0.179605302027 -0.144590775798 0.925041158846 -0.301884576418]
[ 0.179605302027 -0.704880032016 0.0774617736597 0.681825307224]
[ 0.898026510134 0.397624633445 -0.0532812182975 0.180566192161]
Got:
[-0.359210604054 0.569326179705 0.616028985113 0.409076682956]
[ 0.179605302027 -0.144590775798 0.69237507842 -0.683704756325]
[ 0.179605302027 -0.704880032016 0.374205463771 0.575201135981]
[ 0.898026510134 0.397624633445 0.0330954856071 0.185331397251]
**********************************************************************
File
"/mnt/usb1/scratch/buildbot/sage/sage-1/sage_binary/build/sage-4.7.2.alpha2/devel/sage-main/sage/matrix/matrix_double_dense.pyx",
line 1771:
sage: R
Expected:
[ -5.56776436283 2.6940795304 -2.6940795304]
[ 0 -3.56958477752 3.56958477752]
[ 0 0 -9.93013661299e-16]
[ 0 0 0]
Got:
[ -5.56776436283 2.6940795304 -2.6940795304]
[ 0 -3.56958477752 3.56958477752]
[ 0 0 -4.4408920985e-16]
[ 0 0 0]
**********************************************************************
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