# 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. No Results!