data.table v1.7.6

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