[Numpy-discussion] Bug in built in SVD?

Chris Barker Chris.Barker at noaa.gov
Thu Aug 12 11:49:01 EDT 2004

Nadav Horesh wrote:
> It can be a bit more complicate, the story is this:
> One my gentoo system I use ATLAS, and gentoo instaltion generates the ATLAS version of blas and lapack which omit some of the original blas/lapack routines. Till now I used the numarray/Numeric internal lapack_lite package, since every time I tried to compile against the external lapck, I could not load the linear-algebra package because I got an error complaining about a missing "dgesdd_".

I had the same issue, and got this reply from this very list:

Mats Klingberg wrote:
> I recently did this under Gentoo. It seems that the atlas package doesn't 
> build a complete lapack, which is necessary. Instead I emerged the newer 
> blas-atlas and lapack-atlas packages. These build a complete lapack library 
> with atlas optimizations. They are however masked with ~x86 so you have to 
> add the following to your /etc/portage/package.keywords:
> app-sci/lapack-atlas ~x86
> app-sci/blas-atlas ~x86
> app-sci/blas-config ~x86
> app-sci/lapack-config ~x86
> blas-config and lapack-config are packages that are needed by the other ones. 
> They can be used to switch between reference lapack or atlas optimized 
> libraries (if you install lapack-reference and blas-reference)
> For more information see Gentoo bug #30453

I haven't had a chance to try it yet, but I will soon.


Christopher Barker, Ph.D.
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