combn(1:4, 2) will do it. -Ista
On Tuesday 11 May 2010 1:45:14 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. > > 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). 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 ______________________________________________ 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.
