[Numpy-discussion] Int bitsize in python and c

Martin Raspaud martin.raspaud@smhi...
Thu Mar 18 10:32:22 CDT 2010


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Dag Sverre Seljebotn skrev:
> Martin Raspaud wrote:
> Hello,
> 
> I work on a 64bit machine with 64bits enable fedora on it.
> 
> I just discovered that numpy.int on the python part are 64bits ints, while
> npy_int in the C api are 32bits ints.
>   
> 
>> np.intc

Thanks !

But I'm also wondering about the C side. How can I make sure my conversion to
PyArray goes well ? Should I use PyArray_LONG ? or is this also platform dependent ?

Regards,
Martin

> I can live with it, but it seems to be different on 32bit machines, hence I
> wonder what is the right way to do when retrieving an array from python to C.
> 
> Here is what I use now:
> data_pyarray = (PyArrayObject *)PyArray_ContiguousFromObject(data_list,
> PyArray_INT, 1, 2);
> 
> but that implies that I send np.int32 arrays to the C part.
> 
> Should I use longs instead ?
> 
> Regards,
> Martin

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