data.table v1.2

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by M Dowle

Extension of data.frame. i and j expressions, keys and binary search.

Like a data.frame but i and j may be expressions evaluated within the frame. i is then like base::with and j like select in base::subset. When i is itself a data.table, a join is invoked similar to base::merge but uses binary search on the sorted key.

Functions in data.table

Name Description
J Creates a Join data table
tables Display all objects of class 'data.table'
like Convenience function for calling regexpr.
last Last item of an object
setkey Create key on a data table
data.table Enhanced data.frame
test.data.table Runs a set of tests.
Extract.data.table Query a data table
between Convenience function for range subset logic.
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Details

Type Package
Date 2008-08-19
License GPL
Packaged Sun Aug 31 15:23:47 2008; mdowle

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