data.table v1.11.8

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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.

Readme

Overview is on the project's homepage.

Functions in data.table

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

Name
css/bootstrap.css
Makefile
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-secondary-indices-and-auto-indexing.Rmd
flights14.csv
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Last month downloads

Details

License	MPL-2.0 \| file LICENSE
URL	http://r-datatable.com
BugReports	https://github.com/Rdatatable/data.table/issues
VignetteBuilder	knitr
ByteCompile	TRUE
NeedsCompilation	yes
Packaged	2018-09-29 08:30:08.301 UTC; mdowle
Repository	CRAN
Date/Publication	2018-09-30 13:30:03 UTC

suggests	bit64 , curl , knitr , nanotime , R.utils , xts , zoo
imports	methods
depends	R (>= 3.1.0)
Contributors	Tom Short, Steve Lianoglou, Markus Bonsch, Jan Gorecki, Hugh Parsonage, Arunkumar Srinivasan, Eduard Antonyan, Michael Chirico, Pasha Stetsenko