[SciPy-user] Disable ATLAS
Nils Wagner
dr.nwagner at web.de
Sat Feb 21 16:57:20 EST 2004
SciPy Users List <scipy-user at scipy.net> schrieb am 21.02.04 21:03:36:
On Sat, 21 Feb 2004, Nils Wagner wrote:
> Please can you run lu.py
When I set
force_clapack=0
then the output of lu.py is
---------------
X
[[ 1.28518872-0.09428482j -0.46708202-0.37104511j]
[-0.31203795+0.19175932j 0.73496379-0.19732829j]]
inv(A)
[[ 0.91414361+0.3727972j -0.46708202-0.37104511j]
[-0.50936624-0.54320447j 0.73496379-0.19732829j]]
Identity ???
[[ 1.00000000e+00 +2.90295132e-17j -1.99086624e-17 -3.05202912e-17j]
[ 7.09610322e-17 +1.95427442e-16j 1.00000000e-00 +2.33103467e-18j]]
Identity ???
[[ 1.00000000e+00 +1.72794721e-17j -1.99086624e-17 -3.05202912e-17j]
[ -2.36085023e-17 +1.00000000e+00j 1.00000000e-00 +2.33103467e-18j]]
----^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^----------
How about -2.36085023e-17 +1.00000000e+00j ?
The imaginary part should be zero !
Nils
Everything is correct up to round-off errors. So, check again that ATLAS
is not being used. For the record, with force_lapack=1 the results are
incorrect.
As for a possible Atlas bug, I haven't created a simple C program that
would demonstrate the bug and is necessary to file a bug report to Atlas
people. Any takers?
Pearu
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