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data.table (version 1.8.4)

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

1.8.4

License

GPL (>= 2)

Maintainer

M Dowle

Last Published

November 9th, 2012

Functions in data.table (1.8.4)

duplicated

Determine Duplicate Rows
setkey

Create key on a data table
data.table

Enhanced data.frame
truelength

Over-allocation access
all.equal

Equality Test Between Two Data Tables
timetaken

Pretty print of time taken
like

Convenience function for calling regexpr.
IDateTime

Integer based date class
between

Convenience function for range subset logic.
data.table-class

S4 Definition for data.table
:=

Assignment by reference
J

Creates a Join data table
chmatch

Faster match of character vectors
merge

Merge Two Data Tables
subset.data.table

Subsetting data.tables
rbindlist

Makes one data.table from a list of many
tables

Display all objects of class 'data.table'
transform.data.table

Data table utilities
last

Last item of an object
test.data.table

Runs a set of tests.