data.table v1.7.3

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