Numpy 1.12
Numpy 1.12
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numpy.nansum()

numpy.nansum

numpy.nansum(a, axis=None, dtype=None, out=None, keepdims=<class numpy._globals._NoValue at 0x40b6a26c>) [source]

Return the sum of array elements over a given axis treating Not a Numbers (NaNs) as zero.

In NumPy versions <= 1.8.0 Nan is returned for slices that are all-NaN or empty. In later versions zero is returned.

Parameters:

a : array_like

Array containing numbers whose sum is desired. If a is not an array, a conv