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

    .. versionadded:: 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])
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