[R-pkgs] plyr 1.4

From: Hadley Wickham <hadley_at_rice.edu>
Date: Tue, 04 Jan 2011 14:14:50 +0000

# 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 functions.

You can find out more at http://had.co.nz/plyr/, including a 20 page introductory guide, http://had.co.nz/plyr/plyr-intro.pdf. 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 1.4 (2011-01-03)

Version 1.3.1 (2010-12-30)

Version 1.3 (2010-12-28)



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

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Received on Wed 05 Jan 2011 - 01:16:46 EST

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