Hi,
28: there is still one spurious non zero singular value
(3.547702387229884E-7 which I am going to try to kick out) instead of
two.
Dim.
I pushed it to 2.2 because what remained to resolve did not look to
me like a showstopper for 2.1. I may be missing something, though,
regarding severity. I am fine getting this into 2.1 if you have a fix.
I just checked the code and notice the problem is already present at the
exit of TriDiagonalTransform. In order to compute SVD, one computes the
eigen decomposition of A^tA which relies upon the Householder tri-diagonal
transformation. The tri-diagonal maxtrix still has 3 non-zero main diagonal
elements. The smallest one is about 1.e-13, i.e. slightly too large to be
considered null against the largest, about 900.0
Right now, I see no option but avoiding the computation of A^tA. It is
fair to ask for 2.2.
Regards,
Dim.
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Dimitri Pourbaix *
Institut d'Astronomie et d'Astrophysique * Don't worry, be happy
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