data.table v1.8.4
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by M Dowle
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 | |
| setkey | Create key on a data table | |
| data.table | Enhanced data.frame | |
| truelength | Over-allocation access | |
| all.equal | Equality Test Between Two Data Tables | |
| timetaken | Pretty print of time taken | |
| like | Convenience function for calling regexpr. | |
| IDateTime | Integer based date class | |
| between | Convenience function for range subset logic. | |
| data.table-class | S4 Definition for data.table | |
| := | Assignment by reference | |
| J | Creates a Join data table | |
| chmatch | Faster match of character vectors | |
| merge | Merge Two Data Tables | |
| subset.data.table | Subsetting data.tables | |
| rbindlist | Makes one data.table from a list of many | |
| tables | Display all objects of class 'data.table' | |
| transform.data.table | Data table utilities | |
| last | Last item of an object | |
| test.data.table | Runs a set of tests. | |
| No Results! | ||
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Details
| License | GPL (>= 2) |
| URL | http://datatable.r-forge.r-project.org/ |
| BugReports | https://r-forge.r-project.org/tracker/?group_id=240 |
| ByteCompile | TRUE |
| Packaged | 2012-11-09 14:39:44 UTC; mdowle |
| Repository | CRAN |
| Date/Publication | 2012-11-09 15:23:05 |
| depends | base (>= 2.12.0) , R (>= 2.12.0) |
| suggests | chron , fastmatch , ggplot2 (>= 0.9.0) , hexbin , nlme , plyr , reshape , testthat (>= 0.4) , xts |
| imports | methods |
| Contributors | T Short, S Lianoglou, M Dowle |
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