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data.table (version 1.7.3)

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

1,037,494

Version

1.7.3

License

GPL (>= 2)

Maintainer

M Dowle and T Short

Last Published

November 25th, 2011

Functions in data.table (1.7.3)

transform.data.table

Data table utilities
setkey

Create key on a data table
tables

Display all objects of class 'data.table'
last

Last item of an object
duplicated

Determine Duplicate Rows
truelength

Over-allocation access
data.table-class

S4 Definition for data.table
merge

Merge Two Data Tables
like

Convenience function for calling regexpr.
data.table

Enhanced data.frame
J

Creates a Join data table
subset.data.table

Subsetting data.tables
all.equal

Equality Test Between Two Data Tables
timetaken

Pretty print of time taken
IDateTime

Integer based date class
between

Convenience function for range subset logic.
test.data.table

Runs a set of tests.
:=

Assignment by reference