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data.table (version 1.12.8)

Extension of `data.frame`

Description

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.

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Install

install.packages('data.table')

Monthly Downloads

999,142

Version

1.12.8

License

MPL-2.0 | file LICENSE

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Maintainer

Last Published

December 9th, 2019

Functions in data.table (1.12.8)

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.