[Numpy-discussion] inplace dot products

Robert Kern robert.kern@gmail....
Fri Feb 20 09:39:53 CST 2009


On Fri, Feb 20, 2009 at 06:25, David Warde-Farley <dwf@cs.toronto.edu> wrote:
>
> On 20-Feb-09, at 6:39 AM, David Cournapeau wrote:
>
>> You can just use ctypes to access ATLAS, as you would do for any
>> library. Or do you mean something else ?
>
> Say, David... :)
>
> Do you have any idea why the pyf wrapper for fblas3 completely ignores
> the overwrite_c argument?

I believe the "copy" is the culprit.

  double precision dimension(m,n),intent(in,out,copy),depend(m,n),optional :: c

> Fiddling around I've found other blas/lapack
> functions where the same arg is offered but the choice actually does
> something.

Examples?

-- 
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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