data.table v1.7.6
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Extension of data.frame for fast indexing, fast ordered joins, fast assignment, fast grouping and list columns.
Enhanced data.frame. Fast indexing, fast ordered joins, fast assignment, fast grouping and list columns in a short and flexible syntax. i and j may be expressions of column names directly, for faster development. Example: X[Y] is a fast join for large data.
Functions in data.table
| Name | Description | |
| IDateTime | Integer based date class | |
| all.equal | Equality Test Between Two Data Tables | |
| J | Creates a Join data table | |
| duplicated | Determine Duplicate Rows | |
| like | Convenience function for calling regexpr. | |
| merge | Merge Two Data Tables | |
| truelength | Over-allocation access | |
| subset.data.table | Subsetting data.tables | |
| tables | Display all objects of class 'data.table' | |
| last | Last item of an object | |
| between | Convenience function for range subset logic. | |
| := | Assignment by reference | |
| timetaken | Pretty print of time taken | |
| test.data.table | Runs a set of tests. | |
| data.table-class | S4 Definition for data.table | |
| transform.data.table | Data table utilities | |
| setkey | Create key on a data table | |
| data.table | Enhanced data.frame | |
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Details
| License | GPL (>= 2) |
| URL | http://datatable.r-forge.r-project.org/, http://rwiki.sciviews.org/doku.php?id=packages:cran:data.table, http://crantastic.org/packages/data.table |
| BugReports | https://r-forge.r-project.org/tracker/?func=add&group_id=240&atid=975 |
| Packaged | 2011-12-12 21:06:13 UTC; mdowle |
| Repository | CRAN |
| Date/Publication | 2011-12-13 08:36:17 |
| depends | base (>= 2.12.0) , R (>= 2.12.0) |
| suggests | chron , ggplot2 , hexbin , plyr , testthat (>= 0.4) |
| imports | methods |
| Contributors | T Short, S Lianoglou, M Dowle |
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