numpy.count_nonzero

numpy.count_nonzero(a)

Counts the number of non-zero values in the array a.

Parameters :

a : array_like

The array for which to count non-zeros.

Returns :

count : int or array of int

Number of non-zero values in the array.

See also

nonzero

Return the coordinates of all the non-zero values.

Examples

>>> np.count_nonzero(np.eye(4))
4
>>> np.count_nonzero([[0,1,7,0,0],[3,0,0,2,19]])
5