On Wed, Jan 20, 2010 at 8:43 AM, Matthew Dowle <mdo...@mdowle.plus.com> wrote:
> Sounds like a good idea. Would it be possible to give an example of how to
> combine plyr with data.table, and why that is better than a data.table only
> solution ?
Well, ideally, you'd do:
adt <- data.table(a)
ans2 <- ddply(a, c("var1", "var2", "var3"), subset, dt - min(dt) < 7)
and ddply would take care of the details.
Why would it be better? Because plyr works for all data types: data
frames, lists and arrays.
Hadley
--
http://had.co.nz/
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