R: Loop functions

R comes with number of loop functions, to make users task simpler. Following are the loop functions with brief description. In subsequent posts, I am going to explain, each in detail.

lapply : Loop over a list and evaluate a function on each element.

sapply : Same as lapply, but user friendly version of lapply

apply : Apply a function over the margins of array

tapply : Applay a function over subset of vectors

mapply : Multi variate version of apply

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