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data.table (version 1.7.5)

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

847,543

Version

1.7.5

License

GPL (>= 2)

Maintainer

M Dowle and T Short

Last Published

December 4th, 2011

Functions in data.table (1.7.5)

J

Creates a Join data table
last

Last item of an object
setkey

Create key on a data table
truelength

Over-allocation access
data.table

Enhanced data.frame
subset.data.table

Subsetting data.tables
:=

Assignment by reference
like

Convenience function for calling regexpr.
IDateTime

Integer based date class
merge

Merge Two Data Tables
tables

Display all objects of class 'data.table'
duplicated

Determine Duplicate Rows
transform.data.table

Data table utilities
between

Convenience function for range subset logic.
timetaken

Pretty print of time taken
all.equal

Equality Test Between Two Data Tables
data.table-class

S4 Definition for data.table
test.data.table

Runs a set of tests.