data.table v1.8.2
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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 | |
| transform.data.table | Data table utilities | |
| := | Assignment by reference | |
| last | Last item of an object | |
| rbindlist | Makes one data.table from a list of many | |
| J | Creates a Join data table | |
| test.data.table | Runs a set of tests. | |
| truelength | Over-allocation access | |
| tables | Display all objects of class 'data.table' | |
| timetaken | Pretty print of time taken | |
| like | Convenience function for calling regexpr. | |
| chmatch | Faster match of character vectors | |
| setkey | Create key on a data table | |
| merge | Merge Two Data Tables | |
| IDateTime | Integer based date class | |
| subset.data.table | Subsetting data.tables | |
| between | Convenience function for range subset logic. | |
| data.table | Enhanced data.frame | |
| data.table-class | S4 Definition for data.table | |
| all.equal | Equality Test Between Two Data Tables | |
| 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 | 2012-07-17 07:30:11 UTC; mdowle |
| Repository | CRAN |
| Date/Publication | 2012-07-17 19:51:23 |
| depends | base (>= 2.12.0) , R (>= 2.12.0) |
| suggests | chron , fastmatch , ggplot2 (>= 0.9.0) , hexbin , nlme , plyr , reshape , testthat (>= 0.4) |
| imports | methods |
| Contributors | T Short, S Lianoglou, M Dowle |
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