[Numpy-discussion] nanmean(), nanstd() and other "missing" functions for 1.8

Benjamin Root ben.root@ou....
Tue Apr 30 20:36:55 CDT 2013

Currently, I am in the process of migrating some co-workers from Matlab and
IDL, and the number one complaint I get is that numpy has nansum() but no
nanmean() and nanstd().  While we do have an alternative in the form of
masked arrays, most of these people are busy enough trying to port their
existing code over to python that this sort of stumbling block becomes
difficult to explain away.

Given how relatively simple these functions are, I can not think of any
reason not to include these functions in v1.8.  Of course, the
documentation for these functions should certainly include mention of
masked arrays.

There is one other non-trivial function that have been discussed before:
np.minmax().  My thinking is that it would return a 2xN array (where N is
whatever size of the result that would be returned if just np.min() was
used).  This would allow one to do "min, max = np.minmax(X)".

Are there any other functions that others feel are "missing" from numpy and
would like to see for v1.8?  Let's discuss them here.

Ben Root
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