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data.table (version 1.7.1)

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

815,805

Version

1.7.1

License

GPL (>= 2)

Homepage

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

Maintainer

M Dowle and T Short

Last Published

October 22nd, 2011

Functions in data.table (1.7.1)

Merge Two Data Tables

data.table-class

S4 Definition for data.table

Enhanced data.frame

Convenience function for range subset logic.

Determine Duplicate Rows

transform.data.table

Data table utilities

Integer based date class

Create key on a data table

Pretty print of time taken

subset.data.table

Subsetting data.tables

Equality Test Between Two Data Tables

Convenience function for calling regexpr.

Over-allocation access

Creates a Join data table

Last item of an object

test.data.table

Runs a set of tests.

Display all objects of class 'data.table'

Assignment by reference