[R] Any way to apply TWO functions with tapply()?

[hadley wickham]

> As pointed out to me offline, data.table should be added to the list
> of relevant packages as well.  Its primary advantage is for large data
> sets as it is very fast.  Its interface does take some getting used to
> but its most recent version on CRAN does have several vignettes which
> should ease learning.

Note that the development version of plyr is as fast as data.table for
many tasks.  But I don't want to realise it until I'm sure that I
haven't introduced any new bugs.

Hadley


-- 
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/