How to make R running faster

Loops are not massively efficient within R.

Look into using the apply() family of functions
(eapply()/lapply()/mapply/rapply()/tapply()).

Didn't someone post not too long ago that apply is
internally represented as a for-loop? Or am I not
remembering this correctly?

The reason for apply was that it was more concise but not
necessarily more efficient.

Esmail