[R-pkgs] plyr: version 1.5

From: Hadley Wickham <hadley_at_rice.edu>
Date: Mon, 11 Apr 2011 07:16:01 -0500

# plyr

plyr is a set of tools for a common set of problems: you need to __split__ up a big data structure into homogeneous pieces, __apply__ a function to each piece and then __combine__ all the results back together. For example, you might want to:

It's already possible to do this with base R functions (like split and the apply family of functions), but plyr makes it all a bit easier with:

Considerable effort has been put into making plyr fast and memory efficient, and in many cases plyr is as fast as, or faster than, the built-in equivalents.

A detailed introduction to plyr has been published in JSS: "The Split-Apply-Combine Strategy for Data Analysis",

http://www.jstatsoft.org/v40/i01/. You can find out more at
http://had.co.nz/plyr/, or track development at
http://github.com/hadley/plyr. You can ask questions about plyr (and
data manipulation in general) on the plyr mailing list. Sign up at http://groups.google.com/group/manipulatr.

Version 1.5



Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University

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