data.table v1.7.9
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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 | |
| duplicated | Determine Duplicate Rows | |
| between | Convenience function for range subset logic. | |
| J | Creates a Join data table | |
| subset.data.table | Subsetting data.tables | |
| timetaken | Pretty print of time taken | |
| truelength | Over-allocation access | |
| like | Convenience function for calling regexpr. | |
| all.equal | Equality Test Between Two Data Tables | |
| tables | Display all objects of class 'data.table' | |
| := | Assignment by reference | |
| test.data.table | Runs a set of tests. | |
| IDateTime | Integer based date class | |
| transform.data.table | Data table utilities | |
| last | Last item of an object | |
| data.table | Enhanced data.frame | |
| setkey | Create key on a data table | |
| merge | Merge Two Data Tables | |
| data.table-class | S4 Definition for data.table | |
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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/?group_id=240 |
| Packaged | 2012-01-31 01:30:48 UTC; mdowle |
| Repository | CRAN |
| Date/Publication | 2012-01-31 07:30:11 |
| depends | base (>= 2.12.0) , R (>= 2.12.0) |
| suggests | chron , ggplot2 , hexbin , plyr , reshape , testthat (>= 0.4) |
| imports | methods |
| Contributors | T Short, S Lianoglou, M Dowle |
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