data.table v1.7.8

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