plyr: Tools for splitting, applying and combining data

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 high-dimensional arrays to simpler summary statistics. The development of plyr has been generously supported by BD (Becton Dickinson).

Version: 1.8.1
Depends: R (≥ 2.11.0)
Imports: Rcpp (≥ 0.11.0)
LinkingTo: Rcpp
Suggests: abind, testthat, tcltk, foreach, doMC, itertools, iterators
Published: 2014-02-26
Author: Hadley Wickham
Maintainer: Hadley Wickham <h.wickham at>
License: MIT + file LICENSE
NeedsCompilation: yes
Citation: plyr citation info
Materials: README NEWS
CRAN checks: plyr results


Reference manual: plyr.pdf
Package source: plyr_1.8.1.tar.gz
OS X binary: plyr_1.8.1.tgz
Windows binary:
Old sources: plyr archive

Reverse dependencies:

Reverse depends: abctools, bcpa, bigml, bmk, chemosensors, CONOR, CONORData, CPMCGLM, cshapes, Deducer, demi, dynsurv, EBMAforecast, em2, emdbook, ezsim, fishmove, fSRM, gcbd, geospt, ggHorizon, ggmcmc, ggparallel, gpmap, gsDesign, intsvy, kobe, MplusAutomation, MRMR, multilevelPSA, NAPPA, OpenRepGrid, PMA, profileR, psytabs, rAltmetric, rapport, Rcell, rcqp, RDSTK, remix, reshape, reshapeGUI, RForcecom, Rmisc, RSAGA, RStorm, smatr, taRifx, taRifx.geo, timeordered, transnet, TripleR, wethepeople, wordmatch
Reverse imports: acs, aLFQ, alm, AntWeb, AppliedPredictiveModeling, aqp, BatchExperiments, BatchJobs, bayesPop, BEQI2, Biograph, biom, caret, cda, ChemoSpec, choroplethr, classify, clhs, clickstream, coefplot, d3Network, decctools, DescribeDisplay, ecoengine, EpiContactTrace, extracat, ez, FAOSTAT, freqweights, GDELTtools, gems, geoChina, gfcanalysis, GGally, ggmap, ggplot2, ggsubplot, ggtern, GOsummaries, gProfileR, granovaGG, harvestr, HiveR, HLMdiag, hof, IsingSampler, jaatha, kimisc, learningr, lint, llama, lllcrc, lsmeans, lubridate, marked, meifly, metagen, mizer, mpoly, networkTomography, ngramr, nullabor, okmesonet, openair, OutbreakTools, parboost, peptider, pitchRx, planar, plotKML, plusser, PopGenReport, pqantimalarials, primerTree, pROC, qgraph, rapportools, rbhl, rbison, RcmdrPlugin.KMggplot2, rdryad, rebird, RefManageR, repmis, reshape2, rfigshare, rgauges, rgbif, rinat, rmongodb, rnoaa, rplos, RSA, RSiteCatalyst, rsnps, rspear, rtematres, rvertnet, rWBclimate, RXKCD, scales, scholar, semPlot, SGP, simPH, sjPlot, soilDB, solr, sorvi, spocc, ss3sim, sss, Stack, StatRank, strvalidator, surveydata, taxize, toaster, treecm, useful, userfriendlyscience, Wats, weatherData, wppExplorer, XML2R, yhatr, ykmeans
Reverse suggests: abd, bams, bayesGDS, bear, cpca, data.table, dendextend, discreteRV, dostats, eeptools, gcookbook, ggthemes, GSIF, gtable, HistData, installr, Kmisc, knitrBootstrap, Lahman, lme4, mosaic, NlsyLinks, optiRum, plumbr, ProjectTemplate, psd, qdap, rattle, rbefdata, sparseHessianFD, sparseMVN, TimeProjection, trapezoid, trustOptim, vcdExtra