data.table (1.5)

Extension of data.frame for fast subset, fast merge and fast grouping..

http://datatable.r-forge.r-project.org/
http://cran.r-project.org/web/packages/data.table

Enhanced data.frame. Fast subset, grouping and merge in a short and flexible syntax. i and j may be expressions of column names directly, for faster development. Example: data[a>3,sum(b*c),by=d] where data has 4 columns (a,b,c,d).

Maintainer: Developers
Author(s): Matthew Dowle with many contributions from Tom Short. See SVN logs on R-Forge.

License: GPL

Uses: chron, ggplot2
Reverse depends: FAOSTAT, postgwas, randomNames, RecordLinkage, SGP, survMisc, tabplot, treemap
Reverse suggests: Lahman, pcrsim, ProjectTemplate

Released over 2 years ago.

data.table (1.5)

crantastic!