data.table is an enhanced data.frame with fast subset, fast
grouping and fast merge. It uses a short and flexible syntax
which extends existing R concepts.
Example:
DT[a>3,sum(b*c),by=d]
where DT is a data.table with 4 columns (a,b,c,d).
data.table 1.4.1 :
* grouping is now 10+ times faster than tapply()
* extract is 100+ times faster than ==, as before
* 3 new vignettes: Intro, FAQ & Timings
* NEWS file contains further details
http://datatable.r-forge.r-project.org/
http://cran.r-project.org/web/packages/data.table/index.html
There is a new mailing list, datatable-help. Please do send comments,
feedback, problems and questions.
Matthew and Tom
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