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data.table (version 1.7.4)

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

1,453,211

Version

1.7.4

License

GPL (>= 2)

Homepage

http://datatable.r-forge.r-project.org/

Maintainer

M Dowle and T Short

Last Published

November 29th, 2011

Functions in data.table (1.7.4)

Over-allocation access

Enhanced data.frame

Integer based date class

Assignment by reference

Merge Two Data Tables

Create key on a data table

Pretty print of time taken

subset.data.table

Subsetting data.tables

Equality Test Between Two Data Tables

Determine Duplicate Rows

data.table-class

S4 Definition for data.table

Creates a Join data table

Convenience function for range subset logic.

Display all objects of class 'data.table'

test.data.table

Runs a set of tests.

transform.data.table

Data table utilities

Last item of an object

Convenience function for calling regexpr.