@Keith Goodman I think I figured it out. I believe something like the following will do what you want, iterating across one axis specially, so it can apply a median function along an axis. This code in particular is for calculating a moving average and seems to work (though I haven't checked my math). Let me know if you find any problems. def ewma(a, d, int axis = -1): out = np.empty(a.shape, dtype) cdef np.flatiter ita, ito ita = np.PyArray_IterAllButAxis(a, &axis) ito = np.PyArray_IterAllButAxis(out, &axis) cdef int i cdef int axis_length = a.shape[axis] cdef int a_axis_stride = a.strides[axis]/a.itemsize cdef int o_axis_stride = out.strides[axis]/out.itemsize cdef double avg = 0.0 cdef double weight = 1.0 - np.exp(-d) while np.PyArray_ITER_NOTDONE(ita): avg = 0.0 for i in range(axis_length): avg += (<dtype_t*>np.PyArray_ITER_DATA (ita))[i * a_axis_stride ] * weight + avg * (1 - weight) (<dtype_t*>np.PyArray_ITER_DATA (ito))[i * o_axis_stride ] = avg np.PyArray_ITER_NEXT(ita) np.PyArray_ITER_NEXT(ito) return out On Tue, Nov 30, 2010 at 9:46 PM, Felix Schlesinger <schlesin@cshl.edu>wrote:

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),

Oh, that's nice! I'm using 0.11.2. OK, time to upgrade.

Oh wow, does that mean that http://trac.cython.org/cython_trac/ticket/177 is fixed? I couldn't find anything in the release notes about that, but it would be great news. Does the cdef function acquire and hold the buffer?

Felix

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