scipy.sparse.dok_array.

nonzero

dok_array.nonzero()

Nonzero indices of the array/matrix.

Returns a tuple of arrays (row,col) containing the indices of the non-zero elements of the array.

Examples

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>>> from scipy.sparse import csr_array
>>> A = csr_array([[1,2,0],[0,0,3],[4,0,5]])
>>> A.nonzero()
(array([0, 0, 1, 2, 2]), array([0, 1, 2, 0, 2]))

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