[Numpy-discussion] Nansum function behavior

[Stephan Hoyer]

Hi Charles,

You should read the previous discussion about this issue on GitHub:
https://github.com/numpy/numpy/issues/1721

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

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.

Stephan
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