What are you trying to do with
> for (pp in 1:pp+1){
?Also, note that 1:rr+1 and 1:(rr+1) mean different things. Zhou ______________________________________________ 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.
