[Numpy-discussion] average of array containing NaN

Pierre GM pgmdevlist at gmail.com
Mon Jun 25 14:28:50 EDT 2007

On Monday 25 June 2007 14:15:20 Giorgio F. Gilestro wrote:
> Thanks.
> Actually those I care the most are average and std.
> Is there a way to know the number of NaN in an array?

You could use:

But once again 
masked arrays were designed to handle this kind of situation seamlessly. Just 
create a masked_array
masked_array(x, mask=isnan(x))
and use the regular functions/methods on the masked array.

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