[Numpy-discussion] how to work with numpy.int8 in c
David Cournapeau
david at silveregg.co.jp
Wed Mar 3 04:40:45 EST 2010
Francesc Alted wrote:
> A Wednesday 03 March 2010 02:58:31 David Cournapeau escrigué:
>>> PyObject *ret;
>>> PyArray_Descr *typecode;
>>>
>>>
>>> typecode = PyArray_DescrFromType(PyArray_UINT8);
>>> ret = PyArray_Scalar(NULL, typecode, NULL);
>>> Py_DECREF(typecode);
>> ^^^^ Sorry, this is wrong, this does not work on my machine, but I am
>> not sure to understand why.
>
> Well, at least the next works in Cython:
>
> cdef npy_int8 next
> cdef dtype int8
> cdef object current
>
> [...]
> int8 = PyArray_DescrFromType(NPY_INT8)
> current = PyArray_Scalar(&next, int8, None)
Yes, what does not work is the Py_DECREF on typecode. Maybe I
misunderstand the comment on PyArray_Scalar (typecode is not used but
cannot be NULL).
cheers,
David
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