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data.table (version 1.6.2)

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

Description

Enhanced data.frame. Fast indexing, fast ordered joins and fast grouping 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

1,037,494

Version

1.6.2

License

GPL

Maintainer

M Dowle and T Short

Last Published

July 2nd, 2011

Functions in data.table (1.6.2)

all.equal

Equality Test Between Two Data Tables
timetaken

Pretty print of time taken
duplicated

Determine Duplicate Rows
test.data.table

Runs a set of tests.
IDateTime

Integer based date class
J

Creates a Join data table
setkey

Create key on a data table
between

Convenience function for range subset logic.
last

Last item of an object
transform.data.table

Data table utilities
like

Convenience function for calling regexpr.
tables

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

S4 Definition for data.table
data.table

Enhanced data.frame
merge

Merge Two Data Tables