data.table v1.7.2

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Extension of data.frame for fast indexing, fast ordered joins, fast assignment, fast grouping and list columns.

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.

Functions in data.table

Name Description
data.table Enhanced data.frame
between Convenience function for range subset logic.
J Creates a Join data table
duplicated Determine Duplicate Rows
last Last item of an object
test.data.table Runs a set of tests.
merge Merge Two Data Tables
IDateTime Integer based date class
timetaken Pretty print of time taken
tables Display all objects of class 'data.table'
all.equal Equality Test Between Two Data Tables
setkey Create key on a data table
like Convenience function for calling regexpr.
transform.data.table Data table utilities
data.table-class S4 Definition for data.table
subset.data.table Subsetting data.tables
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