numpy.matrix.nonzero
- 
matrix.nonzero()
- 
Return the indices of the elements that are non-zero. Refer to numpy.nonzerofor full documentation.See also - numpy.nonzero
- equivalent function
 
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Licensed under the NumPy License.
    https://docs.scipy.org/doc/numpy-1.11.0/reference/generated/numpy.matrix.nonzero.html