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data.table (version 1.8.6)

Extension of data.frame for fast indexing, fast ordered joins, fast assignment, fast grouping and list columns.

Description

Enhanced data.frame. Fast indexing, fast ordered joins, fast assignment, fast grouping and list columns in a short and flexible syntax. i and j may be expressions of column names directly, for faster development. Example: X[Y] is a fast join for large data.

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Version

Install

install.packages('data.table')

Monthly Downloads

1,453,211

Version

1.8.6

License

GPL (>= 2)

Maintainer

M Dowle

Last Published

November 13th, 2012

Functions in data.table (1.8.6)

data.table-class

S4 Definition for data.table
last

Last item of an object
between

Convenience function for range subset logic.
like

Convenience function for calling regexpr.
chmatch

Faster match of character vectors
all.equal

Equality Test Between Two Data Tables
truelength

Over-allocation access
IDateTime

Integer based date class
rbindlist

Makes one data.table from a list of many
duplicated

Determine Duplicate Rows
merge

Merge Two Data Tables
subset.data.table

Subsetting data.tables
setkey

Create key on a data table
:=

Assignment by reference
tables

Display all objects of class 'data.table'
transform.data.table

Data table utilities
timetaken

Pretty print of time taken
data.table

Enhanced data.frame
J

Creates a Join data table
test.data.table

Runs a set of tests.