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data.table (version 1.8.8)

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

1,004,818

Version

1.8.8

License

GPL (>= 2)

Maintainer

M Dowle

Last Published

March 6th, 2013

Functions in data.table (1.8.8)

IDateTime

Integer based date class
all.equal

Equality Test Between Two Data Tables
setkey

Create key on a data table
chmatch

Faster match of character vectors
:=

Assignment by reference
merge

Merge Two Data Tables
J

Creates a Join data table
fread

Fast and friendly file finagler
data.table-class

S4 Definition for data.table
test.data.table

Runs a set of tests.
timetaken

Pretty print of time taken
between

Convenience function for range subset logic.
like

Convenience function for calling regexpr.
duplicated

Determine Duplicate Rows
subset.data.table

Subsetting data.tables
transform.data.table

Data table utilities
rbindlist

Makes one data.table from a list of many
truelength

Over-allocation access
last

Last item of an object
data.table

Enhanced data.frame
tables

Display all objects of class 'data.table'