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data.table (version 1.6.4)

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

1,037,494

Version

1.6.4

License

GPL

Maintainer

M Dowle and T Short

Last Published

August 10th, 2011

Functions in data.table (1.6.4)

data.table-class

S4 Definition for data.table
cbind

Bind an object to data.table
tables

Display all objects of class 'data.table'
J

Creates a Join data table
all.equal

Equality Test Between Two Data Tables
setkey

Create key on a data table
last

Last item of an object
timetaken

Pretty print of time taken
test.data.table

Runs a set of tests.
merge

Merge Two Data Tables
duplicated

Determine Duplicate Rows
IDateTime

Integer based date class
transform.data.table

Data table utilities
between

Convenience function for range subset logic.
data.table

Enhanced data.frame
like

Convenience function for calling regexpr.