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[Octave-bug-tracker] [bug #44061] U and V result matrices from svds are
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From: |
Marco Caliari |
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Subject: |
[Octave-bug-tracker] [bug #44061] U and V result matrices from svds are not othogonal |
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Date: |
Thu, 29 Jan 2015 12:53:58 +0000 |
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User-agent: |
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0 |
Follow-up Comment #4, bug #44061 (project octave):
1)
[U,S,V] = svds(rand(n))
gives orthogonal matrices, both Matlab and Octave (U'*U=1, not U*U').
2) But for this particular matrix, it does not work. It seems a problem of
eigs when computing only some of the eigenvalues
[V,s] = eigs(eye(2),1)
V is not the matrix of eigenvectors as described in the help and as it is in
Matlab. The dimensions are even wrong (and it is not just the transposed).
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