plyr (1.8.1)
Tools for splitting, applying and combining data.
http://had.co.nz/plyr
http://cran.rproject.org/web/packages/plyr
plyr is a set of tools that solves a common set of problems: you need to break a big problem down into manageable pieces, operate on each pieces and then put all the pieces back together. For example, you might want to fit a model to each spatial location or time point in your study, summarise data by panels or collapse highdimensional arrays to simpler summary statistics. The development of plyr has been generously supported by BD (Becton Dickinson).
Maintainer:
Hadley Wickham
Author(s): Hadley Wickham <h.wickham@gmail.com>
License: MIT + file LICENSE
Uses: Rcpp, abind, doMC, foreach, iterators, testthat, itertools
Reverse depends: abctools, AppliedPredictiveModeling, aqp, BatchExperiments, bigml, Biograph, bmk, caret, cda, charlson, ChemoSpec, classify, coefplot, CONOR, CONORData, CPMCGLM, cshapes, decctools, Deducer, demi, discreteRV, dynsurv, EBMAforecast, eeptools, em2, emdbook, epibase, EpiContactTrace, extracat, ez, ezsim, FAOSTAT, favir, fishmove, gcbd, geospt, GGally, ggmap, ggmcmc, ggparallel, gsDesign, HLMdiag, intsvy, ISIPTA, JAGUAR, kobe, Lahman, latticedl, lsmeans, lubridate, MAc, MAd, mcpd, MplusAutomation, multilevelPSA, networkTomography, nytR, Ohmage, OpenRepGrid, pitchRx, pkDACLASS, plotKML, plotSEMM, PMA, PopGenReport, pROC, productplots, ProjectTemplate, psytabs, pxR, rAltmetric, rcbalance, Rcell, RcmdrPlugin.MAc, RcmdrPlugin.MAd, rcqp, RDSTK, rebird, remix, reshape, reshapeGUI, rfisheries, RForcecom, rgeos, rImpactStory, Rmisc, RSA, RSAGA, RSiteCatalyst, SGP, SixSigma, skills, smatr, soilDB, stringr, tabplot, taRifx.geo, TextRegression, timeordered, transnet, treemap, TripleR, useful, wethepeople, wordmatch
Reverse suggests: abd, afex, bayesGDS, bear, data.table, discreteRV, eeptools, gcookbook, ggdendro, ggswissmaps, ggthemes, GSIF, gtable, HistData, installr, Kmisc, knitrBootstrap, Lahman, lme4, metafor, mosaic, planar, plumbr, ProjectTemplate, psd, qdap, rattle, rbefdata, rgeos, SciencePo, soil.spec, sparseHessianFD, TimeProjection, trapezoid, trustOptim, vcdExtra
Released 10 months ago.
13 previous versions
 plyr_1.8. Released about 2 years ago.
 plyr_1.7.1. Released almost 3 years ago.
 plyr_1.6. Released over 3 years ago.
 plyr_1.5.2. Released over 3 years ago.
 plyr_1.5.1. Released over 3 years ago.
 plyr_1.5. Released over 3 years ago.
 plyr_1.4.1. Released over 3 years ago.
 plyr_1.4. Released almost 4 years ago.
 plyr_1.2.1. Released over 4 years ago.
 plyr_1.1. Released over 4 years ago.
 plyr_1.0.3. Released over 4 years ago.
 plyr_0.1.9.
 plyr_0.1.8.
Ratings
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Reviews

far and away the most useful R package
let me chart the course of my plyr journey. first i discover the elegance of ddply for summary statistics, recoding and reshaping data. then i disc…
thomasjwood gave plyr (1.7.1) a 5. Read the full review.

far and away the most useful R package
let me chart the course of my plyr journey. first i discover the elegance of ddply for summary statistcs, recoding and reshaping data. then i disco…
thomasjwood gave plyr (1.7.1) a 5. Read the full review.

Incredibly useful!
The possibility to easily subset dataframes while calculating all sorts of summaries saves lot's of time and trouble.
bengt.walerud gave plyr (1.5.2) a 5. Read the full review.

incredibly useful, but not very fast
Plyr is an incredibly useful package, greatly simplifing the splitcomputecombine process on data frames and other structure. However, due in part…
harlan.harris gave plyr (0.1.9) a 4. Read the full review.

all that ones need to manipulata data
like sql it provides constructs to manipulate data functionally and using intuitive and flexible plyr's
great thought has been put into it, as…
eamani gave plyr (0.1.9) a 5. Read the full review.
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Visit plyr on R Graphical Manual.