data.table v1.9.2
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by M Dowle
Extension of data.frame
Fast aggregation of large data (e.g. 100GB in RAM), fast ordered joins, fast add/modify/delete of columns by group using no copies at all, list columns and a fast file reader (fread). Offers a natural and flexible syntax, for faster development.
Functions in data.table
| Name | Description | |
| IDateTime | Integer based date class | |
| test.data.table | Runs a set of tests. | |
| chmatch | Faster match of character vectors | |
| J | Creates a Join data table | |
| tables | Display all objects of class 'data.table' | |
| subset.data.table | Subsetting data.tables | |
| timetaken | Pretty print of time taken | |
| last | Last item of an object | |
| all.equal | Equality Test Between Two Data Tables | |
| dcast.data.table | Fast dcast for data.table | |
| merge | Merge Two Data Tables | |
| transform.data.table | Data table utilities | |
| rbindlist | Makes one data.table from a list of many | |
| data.table-class | S4 Definition for data.table | |
| data.table-package | Enhanced data.frame | |
| fread | Fast and friendly file finagler | |
| address | Address in RAM of a variable | |
| between | Convenience function for range subset logic. | |
| := | Assignment by reference | |
| like | Convenience function for calling regexpr. | |
| melt.data.table | Fast melt for data.table | |
| duplicated | Determine Duplicate Rows | |
| truelength | Over-allocation access | |
| setkey | Create key on a data table | |
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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 | 2014-02-27 11:20:02 UTC; mdowle |
| NeedsCompilation | yes |
| Repository | CRAN |
| Date/Publication | 2014-02-27 14:48:59 |
| depends | base (>= 2.14.0) , R (>= 2.14.0) |
| suggests | bit64 , chron , fastmatch , ggplot2 (>= 0.9.0) , hexbin , nlme , plyr , reshape , testthat (>= 0.4) , xts |
| imports | methods , reshape2 |
| Contributors | T Short, S Lianoglou, M Dowle, A Srinivasan |
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