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numpy.diag
- NumPy Documentation, NumPy Developers, 2023 - Official documentation explaining the functionality and usage of np.diag
for creating and extracting diagonal matrices.numpy.triu
and numpy.tril
- NumPy Documentation, NumPy Developers, 2023 - Official documentation detailing the usage of np.triu
and np.tril
for obtaining upper and lower triangular matrices.