[Numpy-discussion] SVD errors

Robert Kern robert.kern@gmail....
Mon Feb 2 18:27:05 CST 2009


On Mon, Feb 2, 2009 at 18:21,  <mtrumpis@berkeley.edu> wrote:
> Hello list.. I've run into two SVD errors over the last few days. Both
> errors are identical in numpy/scipy.
>
> I've submitted a ticket for the 1st problem (numpy ticket #990). Summary
> is: some builds of the lapack_lite module linking against system LAPACK
> (not the bundled dlapack_lite.o, etc) give a "LinAlgError: SVD did not
> converge" exception on my matrix. This error does occur using Mac's
> Accelerate framework LAPACK, and a coworker's Ubuntu LAPACK version. It
> does not seem to happen using ATLAS LAPACK (nor using Octave/Matlab on
> said Ubuntu)

These are almost certainly issues with the particular implementations
of LAPACK that you are using. I don't think there is anything we can
do from numpy or scipy to change this.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless
enigma that is made terrible by our own mad attempt to interpret it as
though it had an underlying truth."
  -- Umberto Eco


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