Unpopular (?) Opinion: Matrices are a great data structure. But, using linear algebra ops for the vectorization speedup alone is often an obfuscating optimization. A well-commented loop over the clearly-named elements is often better. (Plus, ya know -- numba).
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Maybe I'm missing something, but I think that semantics shouldn't leak that far down into code. Keeping the implementation slower for the sake of readability removes so much of the benefit of computing.
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That's why we come up with abstractions: to shield nasty details for all but the brave.
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