[Pkg-octave-devel] Bug#570231: Bug#570231: octave3.2: Errors in working with complex matrices on i386
Thomas Weber
thomas.weber.mail at gmail.com
Thu Feb 18 08:41:11 UTC 2010
On Thu, Feb 18, 2010 at 12:55:21AM +0100, Steven De Herdt wrote:
> On Wed, Feb 17, 2010 at 8:50 PM, Thomas Weber
> <thomas.weber.mail at gmail.com>wrote:
>
> > Could you use the example from the above bug report and see if
> > uninstalling the optimized libraries helps?
> >
> No problem:
>
> **with libatlas3gf-sse2:
>
> octave:1> a = [1 2 3; 4 5 6; 7 8 9]*J;
> octave:2> [u,s,v]=svd(a)
> u =
>
> -0.032510 - 0.122510i 0.334536 - 0.011954i 0.112290 + 0.000145i
> 0.045563 - 0.535097i -0.458023 + 0.414578i 0.736504 + 0.051393i
> 0.070008 - 0.854667i -0.724855 - 0.113233i -0.608726 + 0.014930i
>
> s =
>
> Diagonal Matrix
>
> 17.224974 0 0
> 0 0.922528 0
> 0 0 0.043549
>
> v =
>
> -0.46941 - 0.00000i -0.85522 - 0.00000i 0.21966 + 0.00000i
> -0.56108 - 0.11783i 0.19894 + 0.22349i -0.42448 + 0.61832i
> -0.64827 - 0.17467i 0.39474 - 0.06283i 0.15152 - 0.61790i
>
> octave:3> u*s*v'
> ans =
>
> -0.00000 + 1.00000i 0.61970 + 1.04384i 0.85486 + 1.28824i
> 0.00000 + 4.00000i 0.63485 + 5.41375i 0.91378 + 6.25676i
> 0.00000 + 7.00000i 0.91329 + 8.54694i 1.52782 + 9.65463i
>
>
> **without libatlas3gf-sse2:
>
> octave:1> a = [1 2 3; 4 5 6; 7 8 9]*J;
> octave:2> [u,s,v]=svd(a)
> u =
>
> -0.000000 - 0.214837i -0.000000 - 0.887231i -0.406669 - 0.035873i
> 0.000000 - 0.520587i 0.000000 - 0.249644i 0.813338 + 0.071746i
> 0.000000 - 0.826338i 0.000000 + 0.387943i -0.406669 - 0.035873i
>
> s =
>
> Diagonal Matrix
>
> 1.6848e+01 0 0
> 0 1.0684e+00 0
> 0 0 9.1627e-16
>
> v =
>
> -0.47967 - 0.00000i 0.77669 + 0.00000i 0.40825 + 0.00000i
> -0.57237 - 0.00000i 0.07569 - 0.00000i -0.81650 + 0.00000i
> -0.66506 + 0.00000i -0.62532 + 0.00000i 0.40825 - 0.00000i
>
> octave:3> u*s*v'
> ans =
>
> -0.0000 + 1.0000i 0.0000 + 2.0000i 0.0000 + 3.0000i
> 0.0000 + 4.0000i -0.0000 + 5.0000i -0.0000 + 6.0000i
> 0.0000 + 7.0000i -0.0000 + 8.0000i -0.0000 + 9.0000i
>
> (note that U(:,3) is not quite relevant for this rank-2 matrix)
Okay, so the fault is in the sse2 packages.
> Package libatlas3gf-sse2 has
> http://bugs.debian.org/<http://bugs.debian.org/569436>517826
> and the test mentioned fails with and succeeds without it. Should this bug
> be moved there?
No, there is already a bug there and I want to know when there are
problems in Octave or libraries used by it.
Thanks
Thomas
More information about the Pkg-octave-devel
mailing list