[Numpy-discussion] Owndata flag

[Gregor Thalhammer]

Am 16.12.2011 um 11:53 schrieb Fabrice Silva:

> Le jeudi 15 décembre 2011 à 18:09 +0100, Gregor Thalhammer a écrit :
> 
>> There is an excellent blog entry from Travis Oliphant, that describes
>> how to create a ndarray from existing data without copy:
>> http://blog.enthought.com/?p=62
>> The created array does not actually own the data, but its base
>> attribute points to an object, which frees the memory if the numpy
>> array gets deallocated. I guess this is the behavior you want to
>> achieve. 
>> Here is a cython implementation (for a uint8 array)
> 
> Even better: the addendum!
> http://blog.enthought.com/python/numpy/simplified-creation-of-numpy-arrays-from-pre-allocated-memory/
> 
> Within cython:
> cimport numpy
> numpy.set_array_base(my_ndarray,  PyCObject_FromVoidPtr(pointer_to_Cobj, some_destructor))
> 
> Seems OK.
> Any objections about that ?

This is ok, but CObject is deprecated as of Python 3.1, so it's not portable to Python 3.2.

Gregor