When measuring performance, it is best to use huge numbers (N = randi(1701034) may return a small number, and it would be best that you use something like 1e7 + randi(1e5)). If N is small (and currently it can be), the trivial sum may perform better depending on which operations are running at the server in a given moment.
Remove any row in which a NaN appears
Whether the input is vector?
Change the first and last diagonal element of the identity matrix to zero
Divide by 4
Area of polygon
Non trivial identities - differentiation
Probabilities - More brains than luck
Probabilities - Balls and urns - 01
Probabilities - Balls and urns - 02
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