IUnknown IUnknown - 5 days ago 5
Python Question

Test if numpy array contains only zeros

We initialize a numpy array with zeros as bellow:

np.zeros((N,N+1))


But how do we check whether all elements in a given n*n numpy array matrix is zero.

The method just need to return a True if all the values are indeed zero.

Answer

Check out numpy.count_nonzero.

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