data.table v1.7.7

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