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data.table (version 1.7.1)

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

Description

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

815,805

Version

1.7.1

License

GPL (>= 2)

Maintainer

M Dowle and T Short

Last Published

October 22nd, 2011

Functions in data.table (1.7.1)

merge

Merge Two Data Tables
data.table-class

S4 Definition for data.table
data.table

Enhanced data.frame
between

Convenience function for range subset logic.
duplicated

Determine Duplicate Rows
transform.data.table

Data table utilities
IDateTime

Integer based date class
setkey

Create key on a data table
timetaken

Pretty print of time taken
subset.data.table

Subsetting data.tables
all.equal

Equality Test Between Two Data Tables
like

Convenience function for calling regexpr.
truelength

Over-allocation access
J

Creates a Join data table
last

Last item of an object
test.data.table

Runs a set of tests.
tables

Display all objects of class 'data.table'
:=

Assignment by reference