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! | ||
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Details
| Type | Package |
| Date | 2008-08-19 |
| License | GPL |
| Packaged | Sun Aug 31 15:23:47 2008; mdowle |
| depends | base (>= 2.4.0) , R (>= 2.4.0) , ref |
| Contributors | Matthew Dowle |
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