[R] “For” calculation is so slow

[Zhou Fang]

I'm not sure what you are trying to prove with that example - the loopless
versions are massively faster, no?

I don't disagree that loops are sometimes unavoidable, and I suppose
sometimes loops can be faster when the non-loop version e.g. breaks your
memory budget, or performs tons of needless computations. But I think
avoiding for loops whenever you can is a good rule of thumb in R coding.

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