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data.table (version 1.6.1)

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

1,453,211

Version

1.6.1

License

GPL

Maintainer

M Dowle and T Short

Last Published

June 29th, 2011

Functions in data.table (1.6.1)

IDateTime

Integer based date class
setkey

Create key on a data table
data.table-class

S4 Definition for data.table
J

Creates a Join data table
data.table

Enhanced data.frame
all.equal

Equality Test Between Two Data Tables
like

Convenience function for calling regexpr.
duplicated

Determine Duplicate Rows
transform.data.table

Data table utilities
test.data.table

Runs a set of tests.
last

Last item of an object
between

Convenience function for range subset logic.
tables

Display all objects of class 'data.table'
merge

Merge Two Data Tables
timetaken

Pretty print of time taken
cbind

Bind an object to data.table