Dear Khazaei, What about this?
w <- 1:10 N <- length(w) a <- 1 b <- 1 w[2:(N-1)] <- w[2:(N-1)]*(a/(b+(2:(N-1)))) > w [1] 1.0000000 0.6666667 0.7500000 0.8000000 0.8333333 0.8571429 [7] 0.8750000 0.8888889 0.9000000 10.0000000 Note that here I assumed "a" and "b" were constants 1 and 1, respectively. It is no problem to substitute vectors in for them. As long as "a" and "b" are the same length or a multiple of k...N-1, you can substitute them directly in the formula above and R will just keep using them until it is done. Hope that helps, Josh On Fri, Feb 26, 2010 at 7:23 AM, <khaz...@ceremade.dauphine.fr> wrote: > Hello all, > > I want to define a vector like w[k+1]=w[k]*a/(b+k) for k=1,...,N-1 without > use loop. Is it posible to do in R? > > Regards > > khazaei > > ______________________________________________ > 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<http://www.r-project.org/posting-guide.html> > and provide commented, minimal, self-contained, reproducible code. > -- Joshua Wiley Senior in Psychology University of California, Riverside http://www.joshuawiley.com/ [[alternative HTML version deleted]] ______________________________________________ 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.
