data.table: Extension of data.frame

Fast aggregation of large data (e.g. 100GB in RAM), fast ordered joins, fast add/modify/delete of columns by group using no copies at all, list columns and a fast file reader (fread). Offers a natural and flexible syntax, for faster development.

Version: 1.9.4
Depends: R (≥ 2.14.0)
Imports: methods, chron, reshape2
Suggests: ggplot2 (≥ 0.9.0), plyr, reshape, testthat (≥ 0.4), hexbin, fastmatch, nlme, xts, bit64
Published: 2014-10-02
Author: M Dowle, T Short, S Lianoglou, A Srinivasan with contributions from R Saporta, E Antonyan
Maintainer: Matt Dowle <mdowle at>
License: GPL-2 | GPL-3 [expanded from: GPL (≥ 2)]
NeedsCompilation: yes
Materials: README
In views: Finance, HighPerformanceComputing
CRAN checks: data.table results


Reference manual: data.table.pdf
Vignettes: Frequently asked questions
Quick introduction
Package source: data.table_1.9.4.tar.gz
Windows binaries: r-devel:, r-release:, r-oldrel:
OS X Snow Leopard binaries: r-oldrel: data.table_1.9.4.tgz
OS X Mavericks binaries: r-release: data.table_1.9.4.tgz
Old sources: data.table archive

Reverse dependencies:

Reverse depends: cvAUC, edgeRun, greport, LogisticDx, orgR, panelaggregation, psidR, Rbitcoin, sdcMicro, simPop, slackr, splitstackshape, ttwa, vardpoor, VIM
Reverse imports: aLFQ, APSIM, benford.analysis, Causata, chromer, clickstream, DataCombine, dataview, eeptools, emil, FAOSTAT, FedData, freqweights, gems, genderizeR, IAT, Kmisc, lar, lllcrc, Luminescence, metaMix, miscset, optiRum, partialAR, PGRdup, pxweb, qdapTools, quanteda, RAM, randomNames, RAPIDR, RbioRXN, rdrop2, RecordLinkage, repmis, repra, rerddap, retrosheet, rfisheries, rgauges, rgbif, rio, rnoaa, rplexos, RxnSim, SciencesPo, sdcTable, SGP, simcausal, simPH, solarius, statar, StatMeasures, strvalidator, survMisc, SWMPr, taxize, tcR, traits, translateSPSS2R, treebase, treemap
Reverse suggests: dplyr, installr, Lahman, ProjectTemplate, rlist, taRifx, Xmisc
Reverse enhances: dendextend