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 [[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.
