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
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