data.table v1.6.2

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