Implementing algorithms from scientific whitepapers and having a customer that requires links to the whitepapers and explanations for any variations from the original algorithm (usually for performance).
Having comment-to-code ratio as a quality metric.
In general, though, most code I've written or reviewed has been pretty self-documenting. It gets tricky with numerical methods though, since we haven't fully embraced symbolic computing yet.
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There are some cases where comments are absolutely necessary. Some examples from my career:
forloops for decreasing processing timeIn general, though, most code I've written or reviewed has been pretty self-documenting. It gets tricky with numerical methods though, since we haven't fully embraced symbolic computing yet.