data.table v1.8.10
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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 by reference, 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 | |
| J | Creates a Join data table | |
| all.equal | Equality Test Between Two Data Tables | |
| IDateTime | Integer based date class | |
| chmatch | Faster match of character vectors | |
| last | Last item of an object | |
| merge | Merge Two Data Tables | |
| like | Convenience function for calling regexpr. | |
| data.table | Enhanced data.frame | |
| between | Convenience function for range subset logic. | |
| subset.data.table | Subsetting data.tables | |
| := | Assignment by reference | |
| fread | Fast and friendly file finagler | |
| address | Address in RAM of a variable | |
| setkey | Create key on a data table | |
| rbindlist | Makes one data.table from a list of many | |
| truelength | Over-allocation access | |
| transform.data.table | Data table utilities | |
| data.table-class | S4 Definition for data.table | |
| duplicated | Determine Duplicate Rows | |
| timetaken | Pretty print of time taken | |
| test.data.table | Runs a set of tests. | |
| tables | Display all objects of class 'data.table' | |
| No Results! | ||
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Details
| License | GPL (>= 2) |
| URL | http://datatable.r-forge.r-project.org/, http://stackoverflow.com/questions/tagged/data.table |
| BugReports | https://r-forge.r-project.org/tracker/?group_id=240 |
| MailingList | datatable-help@lists.r-forge.r-project.org |
| ByteCompile | TRUE |
| Packaged | 2013-09-02 23:44:04 UTC; mdowle |
| NeedsCompilation | yes |
| Repository | CRAN |
| Date/Publication | 2013-09-03 06:40:57 |
| depends | base (>= 2.12.0) , R (>= 2.12.0) |
| suggests | bit64 , 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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