numpy-discussion

[Numpy-discussion] Detecting Numeric.

[Andrea R. <ari...@pi...>]

Hi there,
I'm playing with Numeric and even if I've not so much experience with 
it I'm trying to write a C extention to Python that can use Numeric 
arrays. The basic idea consists in handling C (dynamically allocated) 
array as Numeric array (if Numeric is installed) or as simple Python 
lists if not.

How can I detect at compile time if Numeric is installed or not?? I've 
thought something like:

#ifdef NUMERIC_IS_HERE
#include "Numeric/arrayobject.h"
#endif

But I've not found any hints in Numeric manual. Can anyone suggest a 
solution to me?

Thanks in advance,
Andrea.

---
Andrea Riciputi        <mailto:and...@li...>

"Science is like sex: sometimes something useful comes out,
   but that is not the reason we are doing it" -- (Richard Feynman) 
  

Re: [Numpy-discussion] Detecting Numeric.

[Konrad H. <hi...@cn...>]

Andrea Riciputi <ari...@pi...> writes:

> How can I detect at compile time if Numeric is installed or not?? I've
> thought something like:
> 
> #ifdef NUMERIC_IS_HERE
> #include "Numeric/arrayobject.h"
> #endif

Supposing that you will use distutils for compilation and installation
of your extension module, the solution is easy: your distutils script
can test for Numeric and then add the compiler flag. For example:

   defines = []
   try:
       import Numeric
       defines.append('NUMERIC_IS_HERE')
   except ImportError:
       pass

   ...

   Extension("foo", ["foo.c"], define_macros = defines)

Konrad.
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Re: [Numpy-discussion] Detecting Numeric.

[Pearu P. <pe...@ce...>]

On Wed, 11 Dec 2002, Andrea Riciputi wrote:

> Hi there,
> I'm playing with Numeric and even if I've not so much experience with 
> it I'm trying to write a C extention to Python that can use Numeric 
> arrays. The basic idea consists in handling C (dynamically allocated) 
> array as Numeric array (if Numeric is installed) or as simple Python 
> lists if not.
> 
> How can I detect at compile time if Numeric is installed or not?? I've 
> thought something like:
> 
> #ifdef NUMERIC_IS_HERE
> #include "Numeric/arrayobject.h"
> #endif
> 
> But I've not found any hints in Numeric manual. Can anyone suggest a 
> solution to me?

If you are using distutils for building extension modules then you can
test if Numeric is available in setup.py file and define, say, HAVE_NUMPY
macro, if Numeric is available. For example,

#-------

have_numpy = 0
try:
    import Numeric
    have_numpy = 1
except ImportError:
    pass

define_macros = []
if have_numpy:
    define_macros.append(('HAVE_NUMPY', None))

if __name__ == "__main__":

    from distutils.core import setup
    setup(name = ...,
          ext_modules = [...],
          define_macros = define_macros
          )

#---------

and in extension source files use

#ifdef HAVE_NUMPY
...
#endif

HTH,
	Pearu