data.table v1.6.6


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