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data.table (version 1.8.2)

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

847,543

Version

1.8.2

License

GPL (>= 2)

Maintainer

M Dowle

Last Published

July 17th, 2012

Functions in data.table (1.8.2)

duplicated

Determine Duplicate Rows
transform.data.table

Data table utilities
:=

Assignment by reference
last

Last item of an object
rbindlist

Makes one data.table from a list of many
J

Creates a Join data table
test.data.table

Runs a set of tests.
truelength

Over-allocation access
tables

Display all objects of class 'data.table'
timetaken

Pretty print of time taken
like

Convenience function for calling regexpr.
chmatch

Faster match of character vectors
setkey

Create key on a data table
merge

Merge Two Data Tables
IDateTime

Integer based date class
subset.data.table

Subsetting data.tables
between

Convenience function for range subset logic.
data.table

Enhanced data.frame
data.table-class

S4 Definition for data.table
all.equal

Equality Test Between Two Data Tables