[Numpy-discussion] A faster median (Wirth's method)

Matthew Brett matthew.brett@gmail....
Tue Nov 30 13:58:55 CST 2010


On Tue, Nov 30, 2010 at 11:35 AM, Keith Goodman <kwgoodman@gmail.com> wrote:
> On Tue, Nov 30, 2010 at 11:25 AM, John Salvatier
> <jsalvati@u.washington.edu> wrote:
>> I am very interested in this result. I have wanted to know how to do an
> My first thought was to write the reducing function like this
> cdef np.float64_t namean(np.ndarray[np.float64_t, ndim=1] a):
> but cython doesn't allow np.ndarray in a cdef.

Sorry for the ill-considered hasty reply, but do you mean that this:

import numpy as np
cimport numpy as cnp

cdef cnp.float64_t namean(cnp.ndarray[cnp.float64_t, ndim=1] a):
    return np.nanmean(a)  # just a placeholder

is not allowed?  It works for me.  Is it a cython version thing?
(I've got 0.13),

See you,


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