[SciPy-dev] more with SVD wrapping

Nils Wagner nwagner@iam.uni-stuttgart...
Tue Jun 9 00:21:53 CDT 2009


On Mon, 8 Jun 2009 15:31:09 -0700
  M Trumpis <mtrumpis@berkeley.edu> wrote:
> Hi all,
> 
> While I was playing with the f2py wrappings for SVD 
>routines, I went
> ahead and beefed up the *gesdd and *gesvd interfaces, 
>and added a
> wrapping for the "generalized SVD" wrappings, *ggsvd.
> 
> improvements to svd:
> * can query the lapack drivers for best workspace 
>size--this
> eliminates the need for the code in "calc_lwork.f".
> * can ask the drivers to return compact matrices: a = (m 
>x n) ==> u =
> (m x min(m,n)), vh = (min(m,n) x n)
> 
> Use of the *gesvd driver can be toggled with an 
>argument:
> scipy.linalg.svd( ... , fast_svd=False)
> 
> I made two scipy interpretations of the GSVD, one 
>corresponding to the
> lapack docs, and one that is more like the matlab 
>version.
> 
> This ticket supercedes ticket 957.
> 
> http://projects.scipy.org/scipy/ticket/964
> 
> Kind regards,
> Mike
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Hi all,

In view of your recent work ticket 216 could be closed.
  
  http://projects.scipy.org/scipy/ticket/216


Cheers,
                    Nils


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