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How to fill upper triangle of numpy array with zeros in place?
python - Extract upper and lower triangular with different value …
How to get triangle upper matrix without the diagonal using …
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numpy.mask_indices — NumPy v1.26 Manual
scipy.sparse.triu — SciPy v1.13.0 Manual
Who is the Dark Trio and Why are They so Popular? Dark Trio
numpy.triu — NumPy v1.21 Manual
triu (Symbolic Math Toolbox)