Thanks for all your suggestions! I guess I'll have to make tests to see which one is faster :)
Will come back to you when it's done. On 8/21/07, Liaw, Andy <[EMAIL PROTECTED]> wrote: > Similarly: > > s <- c(replicate(N, sample(3))) > > Andy > > From: roger koenker > > One way: > > > > N <- 10 > > s <- c(apply(matrix(rep(1:3,N),3,N),2,sample)) > > > > > > url: www.econ.uiuc.edu/~roger Roger Koenker > > email [EMAIL PROTECTED] Department of Economics > > vox: 217-333-4558 University of Illinois > > fax: 217-244-6678 Champaign, IL 61820 > > > > > > On Aug 21, 2007, at 3:49 PM, Emmanuel Levy wrote: > > > > > Hi, > > > > > > I was wondering the what would be the (most efficient) way > > to generate > > > a sequence > > > of sequences, i mean: > > > > > > if I have 1,2 and 3. > > > > > > I'd like to generate a sequence of length N*3 (N ~ > > 1,000,000 or more) > > > > > > Where random permutations of the sequence 1,2,3 follow each other. > > > > > > i.e 1,2,3,1,3,2,3,2,1 > > > > > > /!\ The thing is that there should never be twice the same number of > > > in the same sub-sequence, meaning that this is different from > > > generating a vector with the numbers 1,2 and 3 randomly distributed. > > > > > > Any suggestion very welcome! Thanks, > > > > > > Emmanuel > > > > > > ______________________________________________ > > > R-help@stat.math.ethz.ch 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. > > > > ______________________________________________ > > R-help@stat.math.ethz.ch 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. > > > > > > > > > ------------------------------------------------------------------------------ > Notice: This e-mail message, together with any attachment...{{dropped}} ______________________________________________ R-help@stat.math.ethz.ch 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.