Hello,
I am working with very large matrices 10000 by 2000
and for each row I have a grouping vector and I would like to average each row by groups...
Presently I am using this command and it behaves correctly even with NA values is the groupvector:
data<-aggregate(mymatrix,list(groupvector),mean)
Is there a faster method Thanks!
Sébastien -- Sébastien Durand Maîtrise en biologie Université de Montréal (514) 343-6864 Université du Québec à Montréal (514) 987-3000 (1572#)
______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
