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data.table (version 1.7.8)

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

847,543

Version

1.7.8

License

GPL (>= 2)

Homepage

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

Maintainer

M Dowle and T Short

Last Published

January 25th, 2012

Functions in data.table (1.7.8)

Integer based date class

Convenience function for range subset logic.

data.table-class

S4 Definition for data.table

Pretty print of time taken

Creates a Join data table

test.data.table

Runs a set of tests.

Create key on a data table

Assignment by reference

Convenience function for calling regexpr.

Determine Duplicate Rows

Display all objects of class 'data.table'

Last item of an object

subset.data.table

Subsetting data.tables

Over-allocation access

Merge Two Data Tables

Equality Test Between Two Data Tables

transform.data.table

Data table utilities

Enhanced data.frame