Ahhhhh, that's exactly what I'm looking for. Thanks a lot. On Sat, Jul 11, 2009 at 11:23 AM, jim holtman<jholt...@gmail.com> wrote: > ?combn > >> combn(10,2) > [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] > [,13] [,14] [,15] [,16] [,17] > [1,] 1 1 1 1 1 1 1 1 1 2 2 2 > 2 2 2 2 2 > [2,] 2 3 4 5 6 7 8 9 10 3 4 5 > 6 7 8 9 10 > [,18] [,19] [,20] [,21] [,22] [,23] [,24] [,25] [,26] [,27] [,28] > [,29] [,30] [,31] [,32] [,33] > [1,] 3 3 3 3 3 3 3 4 4 4 4 > 4 4 5 5 5 > [2,] 4 5 6 7 8 9 10 5 6 7 8 > 9 10 6 7 8 > [,34] [,35] [,36] [,37] [,38] [,39] [,40] [,41] [,42] [,43] [,44] [,45] > [1,] 5 5 6 6 6 6 7 7 7 8 8 9 > [2,] 9 10 7 8 9 10 8 9 10 9 10 10 > > > On Sat, Jul 11, 2009 at 9:23 AM, Hesen Peng<hesen.p...@emory.edu> wrote: >> Hello my R buddies, >> >> I'm trying to generate a bivariate data.frame with the elements of >> first row greater than the second row. The more complicated method >> that I can think of is: >> >> n <- 10 >> temp <- expand.grid(1:n,1:n) >> temp<-temp[temp[,1]>temp[,2],] >> >> However, I guess there must be some easier way of doing this. Besides, >> if inequality condition is applied at the very beginning, this will >> save me a lot of memory if n goes to a very large number. Is there any >> suggestions? Thanks a lot. >> >> Best wishes, >> >> -- >> 彭河森 Hesen Peng >> http://hesen.peng.googlepages.com/ >> >> ______________________________________________ >> 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. >> > > > > -- > Jim Holtman > Cincinnati, OH > +1 513 646 9390 > > What is the problem that you are trying to solve? >
-- 彭河森 Hesen Peng http://hesen.peng.googlepages.com/ ______________________________________________ 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.
