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solve_triangular(lower=False) vs spsolve_triangular(lower=True) #14090

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nschloe opened this issue May 19, 2021 · 0 comments
Open

solve_triangular(lower=False) vs spsolve_triangular(lower=True) #14090

nschloe opened this issue May 19, 2021 · 0 comments
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scipy.linalg scipy.sparse.linalg

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nschloe commented May 19, 2021 •
edited

SciPy has one method for solving triangular systems with dense matrices, solve_triangular and one for sparse matrices spsolve_triangular.

Surprisingly, solve_triangular defaults to lower=False (only consider the upper triangle), spsolve_triangular defaults to lower=True. Perhaps we'll never be able to change this behavior due to backwards compatibility, but I thought I'll point this out. It's a papercut.

This is with SciPy 1.6.3.
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