[Numpy-discussion] Concepts for masked/missing data

[Alan G Isaac]

On 6/25/2011 2:06 PM, Benjamin Root wrote:
> Note that "np.sum([])" also returns 0.0.  I think the
> reason why it has been returning zero instead of NaN was
> because there wasn't a NaN-equivalent for integers.


http://en.wikipedia.org/wiki/Empty_sum

fwiw,
Alan Isaac