[Numpy-discussion] Zero row in SVD's unitary matrix on some Mac's
Jason Grout
jason-sage at creativetrax.com
Tue Apr 26 12:12:06 EDT 2011
On 4/26/11 11:07 AM, Jason Grout wrote:
> And indeed, I get a 0 row as the last row of the V**H matrix
I just double-checked things one last time and saw that I actually
hadn't changed the first argument of zgesdd to "A" in the program that I
actually ran. So with this change, I get a nonzero last row of the V**H
matrix from the C call to zgesdd. So everything is consistent between
the C call to zgesdd and the numpy svd call.
So now my remaining question is: if the Lapack docs only say that V**H
is the full n-by-n matrix if M>=N, why is numpy returning it even if M<N?
Thanks,
Jason
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