Thank you for clarifying, Dr. Gunter. My bad. Regards, Jorge.- On Thu, Oct 18, 2012 at 5:21 PM, Bert Gunter <gunter.ber...@gene.com> wrote:
> No. You need to test more carefully. > > > a <- factor(c(1,3,5)) > > b <- factor(c(5,7)) > > c(a,b) > [1] 1 2 3 1 2 > > lev <- sort(unique(f <- c(a,b))) > > f <- factor(f,levels=lev) > > f > [1] 1 2 3 1 2 > Levels: 1 2 3 > > ## but > > > unlist(list(a,b),use.names=FALSE) > [1] 1 3 5 5 7 > Levels: 1 3 5 7 > > However, Is level "5" in 'a' the same as level "5" in 'b' ? The OP > fails to specify, and there's no reason to assume so. So I would say > clarification is required before any answer can be given. > > -- Bert > > On Wed, Oct 17, 2012 at 10:43 PM, Jorge I Velez > <jorgeivanve...@gmail.com> wrote: > > Hi Sam, > > > > Perhaps the following? > > > >> a <- factor(5:1,levels=1:9) > >> b <- factor(9:1,levels=1:9) > >> lev <- sort(unique(f <- c(a, b))) > >> f <- factor(f, levels = lev) > >> str(f) > > Factor w/ 9 levels "1","2","3","4",..: 5 4 3 2 1 9 8 7 6 5 ... > > > > HTH, > > Jorge.- > > > > > > On Thu, Oct 18, 2012 at 3:44 PM, Sam Steingold <> wrote: > > > >> How do I concatenate two vectors of factors? > >> --8<---------------cut here---------------start------------->8--- > >> > a <- factor(5:1,levels=1:9) > >> > b <- factor(9:1,levels=1:9) > >> > str(c(a,b)) > >> int [1:14] 5 4 3 2 1 9 8 7 6 5 ... > >> > str(unlist(list(a,b),use.names=FALSE)) > >> Factor w/ 9 levels "1","2","3","4",..: 5 4 3 2 1 9 8 7 6 5 ... > >> --8<---------------cut here---------------end--------------->8--- > >> so, unlist(list()) works. > >> is there a better way or is this how this is supposed to be done? > >> Thanks! > >> -- > >> Sam Steingold (http://sds.podval.org/) on Ubuntu 12.04 (precise) X > >> 11.0.11103000 > >> http://www.childpsy.net/ http://honestreporting.com > >> http://think-israel.org http://thereligionofpeace.com > >> http://mideasttruth.com > >> (lisp programmers do it better) > >> > >> ______________________________________________ > >> 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. > >> > > > > [[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. > > > > -- > > Bert Gunter > Genentech Nonclinical Biostatistics > > Internal Contact Info: > Phone: 467-7374 > Website: > > http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm > [[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.
