[Numpy-discussion] extension questions: f2py and cython

[Andrew Hawryluk]

> -----Original Message-----
> From: numpy-discussion-bounces at scipy.org [mailto:numpy-discussion-
> bounces at scipy.org] On Behalf Of Robin
> Sent: 15 Oct 2009 4:37 AM
> To: numpy-discussion at scipy.org
> Subject: [Numpy-discussion] extension questions: f2py and cython
> 
> Hi,
> 
> Sent this last week but checking the archives it appears not to have
> got through. Hopefully this will work...
> 
> I am looking at moving some of my code to fortran to use with f2py. To
> get started I used this simple example:

...

> But I have some questions. It seems to work as is, but I don't set c
to
> zeros anywhere. Can I assume arrays created by f2py are zero?

As I understand it, uninitialized variables in Fortran are
compiler/system-dependent. Some compilers initialize values to zero,
many leave the previous contents of the memory in place. It is safest to
never use the value of an uninitialized variable.

Andrew