data.table v1.8.0

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