Or simply Datagrid <- expand.grid(rep(list(0:1), 8)) apply(Datagrid, 1, paste, collapse = "")
HTH, Thierry ------------------------------------------------------------------------ ---- ir. Thierry Onkelinx Instituut voor natuur- en bosonderzoek / Research Institute for Nature and Forest Cel biometrie, methodologie en kwaliteitszorg / Section biometrics, methodology and quality assurance Gaverstraat 4 9500 Geraardsbergen Belgium tel. + 32 54/436 185 [EMAIL PROTECTED] www.inbo.be To call in the statistician after the experiment is done may be no more than asking him to perform a post-mortem examination: he may be able to say what the experiment died of. ~ Sir Ronald Aylmer Fisher The plural of anecdote is not data. ~ Roger Brinner The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data. ~ John Tukey -----Oorspronkelijk bericht----- Van: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Namens Jim Lemon Verzonden: donderdag 31 juli 2008 13:19 Aan: MarinaTarantini CC: r-help@r-project.org Onderwerp: Re: [R] combinations with replications On Thu, 2008-07-31 at 02:29 -0700, MarinaTarantini wrote: > Dear all, > Is there a way to compute and list all combinations with replication of two > elements in sets of 8 elemnts? > For example, I've two elements, 0 and 1, and I would to get all possible > combinations with replication such as, for example, 00000000, 00000001, > 00000010, and so on. They are 2^8 and it's very hard to list handly!! Hi Marina, Here's a Q&D solution for the specific problem that could easily be extended to different numbers of elements (although it would blow out very quickly).. zero8<-rep(0,8) oneto8<-1:8 cat(zero8,"\n") for(i in 1:7) { combi<-combn(oneto8,i) combcol<-dim(combi)[2] for(comb in 1:combcol) { nextcomb<-zero8 nextcomb[combi[,comb]]<-1 cat(nextcomb,"\n") } } cat(rep(1,8),"\n") Jim ______________________________________________ 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. ______________________________________________ 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.
