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data.table (version 1.8.10)

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 by reference, 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

1.8.10

License

GPL (>= 2)

Maintainer

M Dowle

Last Published

September 3rd, 2013

Functions in data.table (1.8.10)

J

Creates a Join data table
all.equal

Equality Test Between Two Data Tables
IDateTime

Integer based date class
chmatch

Faster match of character vectors
last

Last item of an object
merge

Merge Two Data Tables
like

Convenience function for calling regexpr.
data.table

Enhanced data.frame
between

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

Subsetting data.tables
:=

Assignment by reference
fread

Fast and friendly file finagler
address

Address in RAM of a variable
setkey

Create key on a data table
rbindlist

Makes one data.table from a list of many
truelength

Over-allocation access
transform.data.table

Data table utilities
data.table-class

S4 Definition for data.table
duplicated

Determine Duplicate Rows
timetaken

Pretty print of time taken
test.data.table

Runs a set of tests.
tables

Display all objects of class 'data.table'