scipy.sparse.lil_matrix.

nonzero

lil_matrix.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], dtype=int32), array([0, 1, 2, 0, 2], dtype=int32))

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