data.table v1.13.0

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by Matt Dowle View Source

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, friendly and fast character-separated-value read/write. Offers a natural and flexible syntax, for faster development.

Functions in data.table

Name	Description
between	Convenience functions for range subsets.
key<-	Deprecated.
data.table-package	Enhanced data.frame
chmatch	Faster match of character vectors
cdt	data.table exported C routines
data.table-class	S4 Definition for data.table
datatable.optimize	Optimisations in data.table
duplicated	Determine Duplicate Rows
dcast.data.table	Fast dcast for data.table
fsort	Fast parallel sort
fcoalesce	Coalescing missing values
copy	Copy an entire object
fwrite	Fast CSV writer
fread	Fast and friendly file finagler
print.data.table	data.table Printing Options
frank	Fast rank
fifelse	Fast ifelse
rbindlist	Makes one data.table from a list of many
fcase	fcase
roll	Rolling functions
patterns	Obtain matching indices corresponding to patterns
foverlaps	Fast overlap joins
groupingsets	Grouping Set aggregation for data tables
setDTthreads	Set or get number of threads that data.table should use
melt.data.table	Fast melt for data.table
setcolorder	Fast column reordering of a data.table by reference
setkey	Create key on a data.table
.Last.updated	Number of rows affected by last update
like	Convenience function for calling grep.
merge	Merge two data.tables
setDF	Coerce a data.table to data.frame by reference
timetaken	Pretty print of time taken
transform.data.table	Data table utilities
setops	Set operations for data tables
setNumericRounding	Change or turn off numeric rounding
subset.data.table	Subsetting data.tables
setattr	Set attributes of objects by reference
transpose	Efficient transpose of list
truelength	Over-allocation access
test	Test assertions for equality, exceptions and console output
rowid	Generate unique row ids within each group
setDT	Coerce lists and data.frames to data.table by reference
shouldPrint	For use by packages that mimic/divert auto printing e.g. IRkernel and knitr
na.omit.data.table	Remove rows with missing values on columns specified
nafill	Fill missing values
last	First/last item of an object
setorder	Fast row reordering of a data.table by reference
split	Split data.table into chunks in a list
tables	Display 'data.table' metadata
rleid	Generate run-length type group id
test.data.table	Runs a set of tests.
shift	Fast lead/lag for vectors and lists
special-symbols	Special symbols
tstrsplit	strsplit and transpose the resulting list efficiently
update.dev.pkg	Perform update of development version of a package
:=	Assignment by reference
as.matrix	Convert a data.table to a matrix
address	Address in RAM of a variable
J	Creates a join data.table
IDateTime	Integer based date class
as.xts.data.table	Efficient data.table to xts conversion
as.data.table.xts	Efficient xts to as.data.table conversion
as.data.table	Coerce to data.table
all.equal	Equality Test Between Two Data Tables
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Vignettes of data.table

Name
css/bootstrap.css
plots/grouping_illustration.png
Makefile
Pitching.RData
Teams.RData
datatable-benchmarking.Rmd
datatable-faq.Rmd
datatable-importing.Rmd
datatable-intro.Rmd
datatable-keys-fast-subset.Rmd
datatable-reference-semantics.Rmd
datatable-reshape.Rmd
datatable-sd-usage.Rmd
datatable-secondary-indices-and-auto-indexing.Rmd
flights14.csv
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Details

SystemRequirements	zlib
License	MPL-2.0 \| file LICENSE
URL	http://r-datatable.com, https://Rdatatable.gitlab.io/data.table, https://github.com/Rdatatable/data.table
BugReports	https://github.com/Rdatatable/data.table/issues
VignetteBuilder	knitr
ByteCompile	TRUE
NeedsCompilation	yes
Packaged	2020-07-22 23:00:19.963 UTC; mdowle
Repository	CRAN
Date/Publication	2020-07-24 09:40:06 UTC

suggests	bit64 , curl , knitr , nanotime , R.utils , rmarkdown , xts , yaml , zoo
imports	methods
depends	R (>= 3.1.0)
Contributors	Karl Broman, Toby Hocking, Tom Short, Steve Lianoglou, Kevin Ushey, Jim Hester, Markus Bonsch, Nello Blaser, Jan Gorecki, Rick Saporta, Anthony Damico, Matthieu Gomez, Martin Morgan, Hugh Parsonage, Arunkumar Srinivasan, Eduard Antonyan, Kun Ren, Leonardo Silvestri, Michael Chirico, Seth Wenchel, Roy Storey, Elliott Sales de Andrade, Daniel Possenriede, Xianying Tan, Pasha Stetsenko, Scott Ritchie, Michel Lang, Michael Quinn, Otto Seiskari, Xianghui Dong, Watal Iwasaki, Tobias Schmidt, David Arenburg, Ethan Smith, Francois Cocquemas, Philippe Chataignon, Declan Groves, Felipe Parages, Denes Toth, Mus Yaramaz-David, Ayappan Perumal, James Sams, @javrucebo , @marc-outins , Manish Saraswat, Morgan Jacob, Michael Schubmehl, Davis Vaughan, Tyson Barrett, Dmitry Selivanov, Andrey Riabushenko, Cheng Lee, Sebastian Freundt, David Simons, Cole Miller, Jens Peder Meldgaard, Vaclav Tlapak