Luc,
Concerning MATH-321, the partial fix I proposed has been withdrawn by
the complete rewrite of SVD.
This partial fix also was not considered mathematically sound by Dimitri
since the dimensions of the matrices did not match complete SVD. Well,
this was in fact desired as MATH-321 explicitly asks for non-full SVD.
So I'm not sure anymore what we need to do. If we follow Dimitri's
rationale, we should close this as WON'T FIX. If we decide to fix it, I
think we should postpone it to after 2.1 to have time to decide how we
solve it. SVD has already been vastly improved by Dimitri's work, so I
would really much like to see it published now.
Dim, what do you think about this ?
The version I uploaded does not benefit from any sparsity of the matrix
to be decomposed. I have not looked at any algorithm for this kind of
matrix as it would likely involve a different way of storing the matrix
itself. I agree to put "WON'T FIX" for 321 unless someone can come up
with an example showing that that, for a sparse matrix, the present
version does not return the right answer.
Dim.
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Dimitri Pourbaix *
Institut d'Astronomie et d'Astrophysique * Don't worry, be happy
CP 226, office 2.N4.211, building NO * and CARPE DIEM.
Universite Libre de Bruxelles *
Boulevard du Triomphe * Tel : +32-2-650.35.71
B-1050 Bruxelles * Fax : +32-2-650.42.26
http://sb9.astro.ulb.ac.be/~pourbaix * mailto:pourb...@astro.ulb.ac.be
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