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scipy.sparse.dia_matrix.

# diagonal

dia_matrix.diagonal(k=0)

  Returns the kth diagonal of the array/matrix.

  Parameters:
    k int, optional

      Which diagonal to get, corresponding to elements a[i, i+k]. Default: 0 (the main diagonal).

      Added in version 1.0.

  See also

  `numpy.diagonal`

    Equivalent numpy function.

  Examples

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