Apply-style commands in R

March 14, 2013

(This article was first published on The Data Monkey, and kindly contributed to R-bloggers)

Here's a quick table of what I think are the most useful apply-style commands in R:
FunctionInputOutputBest for
applyRectangularRectangular or vectorApplying function to rows or columns
lapplyAnythingListNon-trivial operations on almost any data type
sapplyAnythingSimplified (if possible) or listSame as lapply, but with simplified output
plyr::ddplydata.framedata.frameApplying function to groupings defined by variables
For alternatives to plyr, see this post on StackOverflow.

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