data.table v1.6.3

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