[Numpy-discussion] Creating a bool array with Cython

Neal Becker ndbecker2@gmail....
Sun Feb 26 08:52:16 CST 2012


Keith Goodman wrote:

> Is this a reasonable (and fast) way to create a bool array in cython?
> 
>     def makebool():
>         cdef:
>             int n = 2
>             np.npy_intp *dims = [n]
>             np.ndarray[np.uint8_t, ndim=1] a
>         a = PyArray_EMPTY(1, dims, NPY_UINT8, 0)
>         a[0] = 1
>         a[1] = 0
>         a.dtype = np.bool
>         return a
> 
> Will a numpy bool array be np.uint8 on all platforms?
> 
> How can I do a.dtype=np.bool using the numpy C api? Is there any point
> (speed) in doing so?

Cython has it's own mail lists - maybe you can find more answers there.



More information about the NumPy-Discussion mailing list