On 11/18/2011 01:05 PM, saschav...@gmail.com wrote:
> daf <- data.frame(
> 'id' = rep(1:5, 3),
> matrix(1:60, nrow=15, dimnames=list( NULL, paste('v', 1:4, sep='') )),
> rep = rep(1:3, each=5)
> )
Hi,
This seems like a job for plyr!
library(plyr)
ddply(daf, .(rep), summarise, mn = mean(v1))
hope this helps,
Paul
--
Paul Hiemstra, Ph.D.
Global Climate Division
Royal Netherlands Meteorological Institute (KNMI)
Wilhelminalaan 10 | 3732 GK | De Bilt | Kamer B 3.39
P.O. Box 201 | 3730 AE | De Bilt
tel: +31 30 2206 494
http://intamap.geo.uu.nl/~paul
http://nl.linkedin.com/pub/paul-hiemstra/20/30b/770
______________________________________________
R-help@r-project.org 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.
