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scipy.sparse.dok_matrix.

# nonzero

dok_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

      >>> 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))