On Sat, Feb 13, 2010 at 08:57:38AM -0600, Kumar Appaiah wrote: > Thanks for being pedantic without providing any alternate suggestions, > but without SVD, I'd say most of the math related packages are > unusable, since they give absurdly wrong results. But I won't play a > severity ping-pong although at least my work and my package(s) are > affected. > > And, I just created a fresh amd64 chroot, and Octave gives me this: > > octave3.2:1> A = [1, 2, 3;4 5 6; 7 8 9]* 1j > A = > > 0 + 1i 0 + 2i 0 + 3i > 0 + 4i 0 + 5i 0 + 6i > 0 + 7i 0 + 8i 0 + 9i > > octave3.2:2> [U, S, V] = svd(A) > U = > > -0.00000 - 0.88741i -0.00000 - 0.88723i -0.39566 - 0.10061i > 0.00000 - 0.25007i -0.00000 - 0.24964i 0.79131 + 0.20122i > 0.00000 + 0.38726i 0.00000 + 0.38794i -0.39566 - 0.10061i > > S = > > Diagonal Matrix > > 1.6848e+01 0 0 > 0 1.0684e+00 0 > 0 0 1.0403e-15 > > 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 > > octave3.2:3> U*S*V' > ans = > > 0.0000 + 6.4354i 0.0000 + 8.4858i 0.0000 + 10.5362i > -0.0000 + 1.8138i -0.0000 + 2.3914i -0.0000 + 2.9689i > 0.0000 - 2.8078i -0.0000 - 3.7031i -0.0000 - 4.5985i > > Some help as to how to debug this package would be appreciated, since, > even according to your "definition" above, several packages are > unusable for me, and the bug is "grave" for me. I would really > appreciate some further pointers in finding where the issue is.
In addition, the problem disappears if Atlas is installed; Octave pulls in Atlas due to some recommendations, I guess. Removing Atlas and retrying it it shows the problem on my amd64 chroot in Octave again. Thanks. Kumar -- In this playhouse of infinite forms I have had my play, and here have I caught sight of him that is formless. - Rabindranath Tagore (Gitanjali, 1912)
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