Assume you have suitable "week" indicator and your data is stored in a data.frame named "data." Then you get the weekly averages by
#simulate data week <- rep(1:52,each=7) x <- week+rnorm(52*7,) y <- rev(week)+rnorm(52*7) #create data frame data=data.frame(week,x,y) #get weekly averages in a list averages=unlist(lapply(split(data,week),colMeans)) #unlist averages and store the results in matrix matrix(averages,byrow=T,ncol=dim(data)[2]) HTH, Daniel -- View this message in context: http://n4.nabble.com/finding-weekly-average-tp1754518p1754604.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.
