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data.table (version 1.7.6)

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

815,805

Version

1.7.6

License

GPL (>= 2)

Maintainer

M Dowle and T Short

Last Published

December 13th, 2011

Functions in data.table (1.7.6)

IDateTime

Integer based date class
all.equal

Equality Test Between Two Data Tables
J

Creates a Join data table
duplicated

Determine Duplicate Rows
like

Convenience function for calling regexpr.
merge

Merge Two Data Tables
truelength

Over-allocation access
subset.data.table

Subsetting data.tables
tables

Display all objects of class 'data.table'
last

Last item of an object
between

Convenience function for range subset logic.
:=

Assignment by reference
timetaken

Pretty print of time taken
test.data.table

Runs a set of tests.
data.table-class

S4 Definition for data.table
transform.data.table

Data table utilities
setkey

Create key on a data table
data.table

Enhanced data.frame