data.table v1.6.1

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

Enhanced data.frame. Fast indexing, fast ordered joins and fast grouping 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
setkey Create key on a data table
data.table-class S4 Definition for data.table
J Creates a Join data table
data.table Enhanced data.frame
all.equal Equality Test Between Two Data Tables
like Convenience function for calling regexpr.
duplicated Determine Duplicate Rows
transform.data.table Data table utilities
test.data.table Runs a set of tests.
last Last item of an object
between Convenience function for range subset logic.
tables Display all objects of class 'data.table'
merge Merge Two Data Tables
timetaken Pretty print of time taken
cbind Bind an object to data.table
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