data.table offers fast subset, fast grouping and fast ordered joins in a short and flexible syntax, for faster development. It was first released in August 2008 and is now the 3rd most popular package on Crantastic with 20 votes and 7 reviews.
* X[Y] is a fast join for large data. * X[,sum(b*c),by=a] is fast aggregation. * 10+ times faster than tapply() * 100+ times faster than == It inherits from data.frame. It is compatible with packages that only accept data.frame. This is a major release that adds S4 compatibility to the package, contributed by Steve Lianoglou. Recently the FAQs have been revised and ?data.table has been simplified with shorter and easier examples. There is a wiki (with content), three vignettes, a video, a NEWS file and an active user community. http://datatable.r-forge.r-project.org/ http://unknownr.r-forge.r-project.org/toppkgs.html Matthew, Tom and Steve _______________________________________________ R-packages mailing list r-packa...@r-project.org https://stat.ethz.ch/mailman/listinfo/r-packages ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
