Thanks, everyone. combn function works pretty well for me.
Best, Jia On Tue, May 11, 2010 at 5:12 PM, Henrique Dallazuanna <www...@gmail.com> wrote: > Or: > > combn(1:4, 2, paste, collapse = ' and ') > > On Tue, May 11, 2010 at 5:54 PM, Ista Zahn <istaz...@gmail.com> wrote: >> >> On Tuesday 11 May 2010 4:27:01 pm David Winsemius wrote: >> > On May 11, 2010, at 1:45 PM, chen jia wrote: >> > > Hi there, >> > > >> > > I am looking for a function that takes a vector as input and generates >> > > all pair wise combination of the elements of the input vector. >> > >> > ?combn >> > >> > > For example, the input vector is c(1,2,3,4). The output vector is c(1 >> > > and 2, 1 and 3, 1 and 4, 2 and 3, 2 and 4, 3 and 4). >> > >> > That's not a vector. >> >> True, although it is possible the OP wanted paste(combn(1:4, 2)[1,], >> "and", >> combn(1:4, 2)[2,]) >> >> -Ista >> >> > >> > > The >> > > representation here is generic. >> > > >> > > I can use a for loop to do it, but it gets slow when the number of >> > > elements of the input vector is large. >> > > >> > > Best, >> > > Jia >> > >> > David Winsemius, MD >> > West Hartford, CT >> > >> > ______________________________________________ >> > 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. > > > > -- > Henrique Dallazuanna > Curitiba-Paraná-Brasil > 25° 25' 40" S 49° 16' 22" O > -- Ohio State University - Finance 248 Fisher Hall 2100 Neil Ave. Columbus, Ohio 43210 Telephone: 614-292-2830 http://www.fisher.osu.edu/~chen_1002/ ______________________________________________ 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.
