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data.table (version 1.5.2)

Extension of data.frame for fast subset, fast merge and fast grouping.

Description

Enhanced data.frame. Fast subset, grouping and merge 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

1.5.2

License

GPL

Maintainer

M Dowle

Last Published

January 21st, 2011

Functions in data.table (1.5.2)

J

Creates a Join data table
transform.data.table

Data table utilities
setkey

Create key on a data table
Extract.data.table

Query a data table
data.table

Enhanced data.frame
tables

Display all objects of class 'data.table'
like

Convenience function for calling regexpr.
IDateTime

Integer based date class
duplicated

Determine Duplicate Rows
test.data.table

Runs a set of tests.
timetaken

Pretty print of time taken
between

Convenience function for range subset logic.
last

Last item of an object
merge

Merge Two Data Tables