data.table v1.4.1

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Extension of data.frame for fast subset, fast merge and fast grouping.

Enhanced data.frame. Fast subset, grouping and merge in a short and flexible syntax. i and j may be expressions of column names directly, for faster development. Example: data[a>3,sum(b*c),by=d] where data has 4 columns (a,b,c,d).

Functions in data.table

Name Description
test.data.table Runs a set of tests.
transform.data.table Data table utilities
J Creates a Join data table
setkey Create key on a data table
Extract.data.table Query a data table
timetaken Pretty print of time taken
duplicated Determine Duplicate Rows
between Convenience function for range subset logic.
tables Display all objects of class 'data.table'
last Last item of an object
data.table Enhanced data.frame
like Convenience function for calling regexpr.
merge Merge Two Data Tables
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Details

License GPL
URL http://datatable.r-forge.r-project.org/
Packaged 2010-05-03 00:03:11 UTC; home
Repository CRAN
Date/Publication 2010-05-03 08:40:44

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