[SciPy-User] Calling LAPACK function dbdsqr()?

Sturla Molden sturla@molden...
Fri Dec 14 09:54:22 CST 2012


On 14.12.2012 16:38, Jonathan Helmus wrote:

> Not sure if this is portable or is possible on all or even most Scipy
> installs but I can find a pointer to the LAPACK dbdsqr function in the
> clapack/flapack shared library using ctypes on my EDP 7.3.1 rh5 install:
>
>
> In [1]: from ctypes import *
>
> In [2]: import scipy.linalg
>
> In [3]: lib = CDLL(scipy.linalg.lapack.clapack.__file__)

That will not be cross-platform, but depend on ABI for the Fortran 
compiler used on the particular platform. Cross-platform ABI dependency 
is a PITA.

CLAPACK is also abandonware, LAPACKE is the current C/C++ interface. 
Thus with any recent LAPACK, there will be no clapack in SciPy.

I hope that SciPy at some point could start to use LAPACKE.

Another cross-platform solution is to use the Fortran 2003 ISO C binding 
and Cython (i.e. fwrap instead of f2py).

Sturla









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