# data.table v1.1

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by M Dowle

## Extension of data.frame to allow i and j to be expressions of column names.

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.

## Functions in data.table

 Name Description setkey Create key on a data table J Creates a Join data table Extract.data.table Query a data table like Convenience function for calling regexpr. tables Display all objects of class 'data.table' between Convenience function for range subset logic. test.data.table Runs a set of tests. data.table Enhanced data.frame last Last item of an object No Results!