[Numpy-discussion] Nansum function behavior

Stephan Hoyer shoyer at gmail.com
Fri Oct 23 21:28:27 EDT 2015

Hi Charles,

You should read the previous discussion about this issue on GitHub:

For what it's worth, I do think the new definition of nansum is more

If you want to preserve NaN if there are no non-NaN values, you can often
calculate this desired quantity from nanmean, which does return NaN if
there are only NaNs.

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