numpy.ma.MaskedArray.sum¶
-
MaskedArray.
sum
(axis=None, dtype=None, out=None, keepdims=<class 'numpy._globals._NoValue'>)[source]¶ Return the sum of the array elements over the given axis.
Masked elements are set to 0 internally.
Refer to
numpy.sum
for full documentation.See also
ndarray.sum
- corresponding function for ndarrays
numpy.sum
- equivalent function
Examples
>>> x = np.ma.array([[1,2,3],[4,5,6],[7,8,9]], mask=[0] + [1,0]*4) >>> print(x) [[1 -- 3] [-- 5 --] [7 -- 9]] >>> print(x.sum()) 25 >>> print(x.sum(axis=1)) [4 5 16] >>> print(x.sum(axis=0)) [8 5 12] >>> print(type(x.sum(axis=0, dtype=np.int64)[0])) <type 'numpy.int64'>