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For cycles in R and computational speed

In the past, I wrote R code that requires for loops inside for loops. Usually this code is quite laborious to execute. I read online, this is the result of how loops work in R. I also read that using loops in another language inside R eg C ++ or Java can speed up the computational time.

Does anyone have any experience with this and can point me to some simple examples that I can read?

You can also call a different language for the for loop, but still, everything inside the loop should be in standard R code?

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