[Numpy-discussion] NumPy-Discussion OpenBLAS and dotblas

Robert Kern robert.kern at gmail.com
Wed Aug 13 05:50:22 EDT 2014

On Wed, Aug 13, 2014 at 12:47 AM, Sturla Molden <sturla.molden at gmail.com> wrote:
> Robert Kern <robert.kern at gmail.com> wrote:
>>>> BLAS/LAPACK are heavy dependencies that often give problems, which is why
>>>> you don't want to require them for the casual user that only needs numpy
>>>> arrays to make some plots for examples.
>>> Maybe we are not talking about the same thing, but isn't blas_lite.c and
>>> lapack_lite.c more or less f2c'd versions of reference BLAS and reference
>> Not all of them, no. Just the routines that numpy itself uses. Hence, "lite".
> I thought it got the 'lite' name because Netlib up to LAPACK 3.1.1 had
> packages named 'lapack-lite-3.1.1.tgz' in addition to 'lapack-3.1.1.tgz'.
> (I am not sure what the differences between the packages were.)



> The lapack_lite.c file looks rather complete, but it seems the build
> process somehow extracts only parts of it.

I assume you mean dlapack_lite.c? It is incomplete. It is the end
product of taking the full LAPACK 3.0 distribution, stripping out the
routines that are not used in numpy, and f2cing the subset. Go ahead
and look for the routines in LAPACK 3.0 systematically, and you will
find many of them missing.

Robert Kern

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