On Wed, Jan 20, 2010 at 8:43 AM, Matthew Dowle <[email protected]> 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/
______________________________________________
[email protected] 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.
