numpy.triu

numpy.triu(m, k=0) [source]

Upper triangle of an array.

Return a copy of an array with the elements below the k-th diagonal zeroed.

Please refer to the documentation for tril for further details.

See also

tril

lower triangle of an array

Examples

>>> np.triu([[1,2,3],[4,5,6],[7,8,9],[10,11,12]], -1)
array([[ 1,  2,  3],
       [ 4,  5,  6],
       [ 0,  8,  9],
       [ 0,  0, 12]])

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https://numpy.org/doc/1.20/reference/generated/numpy.triu.html