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!
S�bastien -- S�bastien Durand Ma�trise en biologie Universit� de Montr�al (514) 343-6864 Universit� du Qu�bec � Montr�al (514) 987-3000 (1572#)
______________________________________________ [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
