On Wed, Nov 11, 2009 at 08:53:50AM -0800, William Dunlap wrote: > > Perhaps > > ave(x, rev(cumsum(rev(is.na(x)))), FUN=cumsum) > [1] 1 3 6 NA 5 11 18 26 35 45 >
it takes some time to understand how it works, but it's perfect. thank you, stefan ______________________________________________ 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.
