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data.table (version 1.6.5)

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

Description

Enhanced data.frame. Fast indexing, fast ordered joins, fast assignment 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

847,543

Version

1.6.5

License

GPL

Maintainer

M Dowle and T Short

Last Published

August 25th, 2011

Functions in data.table (1.6.5)

J

Creates a Join data table
data.table-class

S4 Definition for data.table
tables

Display all objects of class 'data.table'
like

Convenience function for calling regexpr.
cbind

Bind an object to data.table
timetaken

Pretty print of time taken
setkey

Create key on a data table
transform.data.table

Data table utilities
IDateTime

Integer based date class
duplicated

Determine Duplicate Rows
merge

Merge Two Data Tables
last

Last item of an object
data.table

Enhanced data.frame
all.equal

Equality Test Between Two Data Tables
test.data.table

Runs a set of tests.
between

Convenience function for range subset logic.