On Fri, Mar 26, 2010 at 12:00 AM, Dag Sverre Seljebotn
<[email protected]> wrote:
>
> I expect you are doing lots and lots of really small summations?
> Otherwise there's no real point.
>
Correct...lots of very small sums.
> You unfortunately need to do
>
> cdef double sum(object x, unsigned int
> start, unsigned int stop, int skip):
> cdef np.ndarray[np.float64_t, ndim=1] x_buf = x
>
>
Thanks!
> then use x_buf. There's a slight speed penalty with that assignment which
>
> Also, please use Py_ssize_t instead of unsigned int. unsigned ints are
> dangerous in Cython.
>
Whoops. I was following:
http://wiki.cython.org/tutorials/numpy
to avoid negative indexes, but I just found negative_indexes=False:
http://wiki.cython.org/enhancements/buffer
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