data.table v1.12.8

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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
J	Creates a join data.table
foverlaps	Fast overlap joins
fifelse	Fast ifelse
duplicated	Determine Duplicate Rows
dcast.data.table	Fast dcast for data.table
chmatch	Faster match of character vectors
fcoalesce	Coalescing missing values
data.table-class	S4 Definition for data.table
copy	Copy an entire object
data.table-package	Enhanced data.frame
datatable.optimize	Optimisations in data.table
fwrite	Fast CSV writer
groupingsets	Grouping Set aggregation for data tables
roll	Rolling functions
fsort	Fast parallel sort
like	Convenience function for calling grep.
melt.data.table	Fast melt for data.table
patterns	Obtain matching indices corresponding to patterns
print.data.table	data.table Printing Options
rowid	Generate unique row ids within each group
.Last.updated	Number of rows affected by last update
last	First/last item of an object
set2key	Deprecated.
rbindlist	Makes one data.table from a list of many
rleid	Generate run-length type group id
fread	Fast and friendly file finagler
frank	Fast rank
merge	Merge two data.tables
setattr	Set attributes of objects by reference
setNumericRounding	Change or turn off numeric rounding
setcolorder	Fast column reordering of a data.table by reference
setkey	Create key on a data.table
setDF	Coerce a data.table to data.frame by reference
na.omit.data.table	Remove rows with missing values on columns specified
setops	Set operations for data tables
special-symbols	Special symbols
transpose	Efficient transpose of list
setDT	Coerce lists and data.frames to data.table by reference
truelength	Over-allocation access
nafill	Fill missing values
subset.data.table	Subsetting data.tables
setorder	Fast row reordering of a data.table by reference
test	Test assertions for equality, exceptions and console output
tables	Display 'data.table' metadata
test.data.table	Runs a set of tests.
shift	Fast lead/lag for vectors and lists
shouldPrint	For use by packages that mimic/divert auto printing e.g. IRkernel and knitr
transform.data.table	Data table utilities
timetaken	Pretty print of time taken
setDTthreads	Set or get number of threads that data.table should use
split	Split data.table into chunks in a list
tstrsplit	strsplit and transpose the resulting list efficiently
update.dev.pkg	Perform update of development version of a package
address	Address in RAM of a variable
as.data.table.xts	Efficient xts to as.data.table conversion
as.matrix	Convert a data.table to a matrix
as.data.table	Coerce to data.table
as.xts.data.table	Efficient data.table to xts conversion
all.equal	Equality Test Between Two Data Tables
IDateTime	Integer based date class
:=	Assignment by reference
between	Convenience functions for range subsets.
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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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Last month downloads

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	2019-12-08 22:28:25.859 UTC; mdowle
Repository	CRAN
Date/Publication	2019-12-09 10:30:10 UTC

suggests	bit64 , curl , knitr , nanotime , R.utils , xts , yaml , zoo
imports	methods
depends	R (>= 3.1.0)
Contributors	Karl Broman, Tom Short, Steve Lianoglou, Markus Bonsch, Jan Gorecki, Rick Saporta, Matthieu Gomez, Martin Morgan, Hugh Parsonage, Arunkumar Srinivasan, Eduard Antonyan, Kun Ren, Michael Chirico, Seth Wenchel, Roy Storey, 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