install.packages("data.table")

# latest development version (only if newer available)
data.table::update_dev_pkg()

# latest development version (force install)
install.packages("data.table", repos="https://rdatatable.gitlab.io/data.table")

library(data.table)
DT = as.data.table(iris)

# FROM[WHERE, SELECT, GROUP BY]
# DT  [i,     j,      by]

DT[Petal.Width > 1.0, mean(Petal.Length), by = Species]
#      Species       V1
#1: versicolor 4.362791
#2:  virginica 5.552000

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1.18.6.1 by Tyson Barrett, 2 months ago

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https://r-datatable.com, https://Rdatatable.gitlab.io/data.table, https://github.com/Rdatatable/data.table

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Report a bug at https://github.com/Rdatatable/data.table/issues

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Browse source code at https://github.com/cran/data.table

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Authors: Tyson Barrett [aut, cre] (ORCID: , Matt Dowle [aut] , Arun Srinivasan [aut] , Jan Gorecki [aut] , Michael Chirico [aut] , Toby Hocking [aut] , Benjamin Schwendinger [aut] (ORCID: , Ivan Krylov [aut] , Pasha Stetsenko [ctb] , Tom Short [ctb] , Steve Lianoglou [ctb] , Eduard Antonyan [ctb] , Markus Bonsch [ctb] , Hugh Parsonage [ctb] , Scott Ritchie [ctb] , Kun Ren [ctb] , Xianying Tan [ctb] , Rick Saporta [ctb] , Otto Seiskari [ctb] , Xianghui Dong [ctb] , Michel Lang [ctb] , Watal Iwasaki [ctb] , Seth Wenchel [ctb] , Karl Broman [ctb] , Tobias Schmidt [ctb] , David Arenburg [ctb] , Ethan Smith [ctb] , Francois Cocquemas [ctb] , Matthieu Gomez [ctb] , Philippe Chataignon [ctb] , Nello Blaser [ctb] , Dmitry Selivanov [ctb] , Andrey Riabushenko [ctb] , Cheng Lee [ctb] , Declan Groves [ctb] , Daniel Possenriede [ctb] , Felipe Parages [ctb] , Denes Toth [ctb] , Mus Yaramaz-David [ctb] , Ayappan Perumal [ctb] , James Sams [ctb] , Martin Morgan [ctb] , Michael Quinn [ctb] , @javrucebo [ctb] (GitHub user) , Marc Halperin [ctb] , Roy Storey [ctb] , Manish Saraswat [ctb] , Morgan Jacob [ctb] , Michael Schubmehl [ctb] , Davis Vaughan [ctb] , Leonardo Silvestri [ctb] , Jim Hester [ctb] , Anthony Damico [ctb] , Sebastian Freundt [ctb] , David Simons [ctb] , Elliott Sales de Andrade [ctb] , Cole Miller [ctb] , Jens Peder Meldgaard [ctb] , Vaclav Tlapak [ctb] , Kevin Ushey [ctb] , Dirk Eddelbuettel [ctb] , Tony Fischetti [ctb] , Ofek Shilon [ctb] , Vadim Khotilovich [ctb] , Hadley Wickham [ctb] , Bennet Becker [ctb] , Kyle Haynes [ctb] , Boniface Christian Kamgang [ctb] , Olivier Delmarcell [ctb] , Josh O'Brien [ctb] , Dereck Mezquita [ctb] , Michael Czekanski [ctb] , Dmitry Shemetov [ctb] , Nitish Jha [ctb] , Joshua Wu [ctb] , Iago Giné-Vázquez [ctb] , Anirban Chetia [ctb] , Doris Amoakohene [ctb] , Angel Feliz [ctb] , Michael Young [ctb] , Mark Seeto [ctb] , Philippe Grosjean [ctb] , Vincent Runge [ctb] , Christian Wia [ctb] , Elise Maigné [ctb] , Vincent Rocher [ctb] , Vijay Lulla [ctb] , Aljaž Sluga [ctb] , Bill Evans [ctb] , Reino Bruner [ctb] , @badasahog [ctb] (GitHub user) , Vinit Thakur [ctb] , Mukul Kumar [ctb] , Ildikó Czeller [ctb] , Manmita Das [ctb] , Tarun Thammisetty [ctb] , Marco Colombo [ctb] , Tim Taylor [ctb]

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Documentation:   PDF Manual  

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MPL-2.0 | file LICENSE license

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Imports methods

Suggests bit64, bit, R.utils, xts, zoo, yaml, knitr, markdown

---

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Suggested by AMR, BEDMatrix, BGData, BTM, BayesSUR, CRMetrics, Certara.DarwinReporter, Certara.Xpose.NLME, ClustAssess, ComplexUpset, CopernicusDEM, DatabaseConnector, Durga, Dyn4cast, EWSmethods, GTFSwizard, GaussSuppression, HCUPtools, HVT, INLAspacetime, ISPAT3D, LBDiscover, LMMstar, Lahman, LambertW, Largevars, LocalControl, LogicForest, MatrixExtra, MetricGraph, MicroMoB, MoBPS, NSR, OptimalBinningWoE, PeakSegOptimal, PhysicalActivity, PhytoIn, PortfolioAnalytics, ProjectTemplate, RAINBOWR, RTransferEntropy, Rblpapi, RcmdrPlugin.WorldFlora, Rdatasets, SLEMI, SSBtools, Seurat, ShinyItemAnalysis, SightabilityModel, SmallCountRounding, Sojourn, SurprisalAnalysis, SynthesizerPlus, TextMiningGUI, TrialSimulator, WQM, WVPlots, WebAnalytics, WorldFlora, actimetrics, actisomni, adjustedCurves, adlaplace, analyzer, aplotExtra, arcgisgeocode, arcgisutils, autoslider.core, azr, basetable, bclogit, bigstatsr, bikeshare14, bpcp, bysykkel, catcont, causalOT, cayleyR, cdid, cfr, cheapr, checkmate, chem.databases, cmsaf, collapse, colorDF, conText, constructive, corrselect, countries, cppSim, cryptoQuotes, dang, datapackage, datapasta, dataprep, datarobot, datasetjson, dataverifyr, datawizard, dbcturbo, dbi.table, decimal, denvax, drake, ecospace, ecotox, editbl, effClust, envalysis, epanetReader, epiworldR, epm, eventglm, factor256, fastai, fastplyr, fereg, filecacher, finbif, fixest, flexsynth, flowTraceR, flps, foresty, forrest, fst, future.tests, gbif.range, geobr, gfpop, ggInterval, ggfixest, ggpedigree, gmeans, googleVis, grandR, gsDesign, gtfsrealtime, gustave, h2o, handlr, harmony, hbamr, heaping, hermiter, heteroTests, highdir, htetree, hydropeak, ie2miscdata, iemisctext, implicitMeasures, ineAtlas, inplace, installr, interface, ipeaplot, itsadug, ivmte, jab.adverse.reactions, joinspy, kalmanfilter, kgraph, kimfilter, lava, lavaSearch2, lay, lazytrade, leiden, lfe, lgr, limorhyde, liver, measles, medicalcoder, mergen, metamer, micemd, milr, misha, mixvlmc, mrgsolve, multinets, multiscape, nanotime, ncdfCF, netCoin, nhppp, nlmixr2est, nlmixr2plot, nlmixr2save, nomads, onlineforecast, onsr, origin, outliertree, padr, pagoda2, pander, parallelMap, pedalfast.data, pedbp, pins, plotHMM, pmcalibration, pmml, pointblank, preventr, primer, prioriactions, privacyR, prnsamplr, qbrms, qs2, r2glmm, radiatR, randomForestSRC, raqs, rdhs, rdwd, read.gt3x, readyomics, recometrics, rehh, remotePARTS, reservr, rotor, rpivotTable, rstanarm, rtemis.draw, rtop, sequoia, skimr, sportyR, staggeredGMM, sticky, stringmagic, targeted, tbl.now, tcplfit2, telegramR, textrecipes, tidypopgen, tidypredict, tidyr, tidysdm, tidytext, tiledb, tinycodet, tinytable, tinytrail, tsdb, umx, unifed, unnest, vaersNDvax, vaersvax, versioning, vtreat, weightedsurv, where, wmm, wrMisc, wrProteo, xfun, xlr, xpectr, xplorerr, zmisc.

Enhanced by dendextend, lintr, lubridate, repr, tind.

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See at CRAN