[Numpy-discussion] copying in nanXXX
Damian Eads
eads@soe.ucsc....
Sun Jun 29 19:24:43 CDT 2008
Hi there,
I'm using nansum for some code and noticed it does a bit of copying.
Specifically, the nanxxx functions copy the input array, create an isnan
boolean mask, set the nan values to make them insignificant (nansum: 0,
nanmin: inf, or nanmax: -inf), and then call xxx to compute the statistic.
def nansum(a, axis=None):
"""Sum the array over the given axis, treating NaNs as 0.
"""
y = array(a,subok=True)
if not issubclass(y.dtype.type, _nx.integer):
y[isnan(a)] = 0
return y.sum(axis)
Unless someone has already done this, I will offer to write C versions
of these functions. Does anyone else think this is useful?
Cheers,
Damian
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