data.table v1.7.5

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