[Pyrex] Numeric and Pyrex

[Nitin Madnani]

Hmm ... here's what I tried:

import Numeric

cdef extern from "/nfshomes/nmadnani/local/include/python2.4/Numeric/ 
arrayobject.h":

     struct PyArray_Descr:
         int type_num, elsize
         char type

     ctypedef class Numeric.ArrayType [object PyArrayObject]:
         cdef char *data
         cdef int nd
         cdef int *dimensions, *strides
         cdef object base
         cdef PyArray_Descr *descr
         cdef int flags

def estimate_future_costs(phrase_dict, sent):
     cdef int i,j
     cdef float* elems
     m = Numeric.zeros((3, 3), Numeric.Float)

So my question is that now that I have an Numeric array that I have  
created, how do I access its C internals since 'm' is now a python  
object right? Things like 'm.data' etc. don't seem to work. I would  
really appreciate an example !!

Thanks !
Nitin

On Sep 19, 2005, at 10:39 AM, Nitin Madnani wrote:

> Hmm, I see. So I can call Numeric pythonically to create the array  
> and then use the external type code as demonstrated in your example  
> to fill it ? And I can do both of these things in the same pyrex  
> module?
>
> Did I get that right? Awesome !
> Nitin
>
> On Sep 19, 2005, at 3:29 AM, Greg Ewing wrote:
>
>
>> Nitin Madnani wrote:
>>
>>
>>
>>> I need to be able to create Numeric arrays inside my pyrex  
>>> function  and be able to return that created Numeric array as the  
>>> result of my  function.
>>>
>>>
>>
>> The easiest way to create a Numeric array in Pyrex is
>> the same way you would do it in Python, i.e. by
>> calling its constructor, or one of the functions in the
>> Numeric module that constructs arrays.
>>
>> If you declare the Numeric array type as an external
>> extension type, then once you've created it, you can
>> access its C internals to put data into it. One of the
>> demos that comes with Pyrex shows the declarations
>> you need.
>>
>> Greg
>>
>>
>
>
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