OK, someone point it out to me; my wife tells me I can't see what's in front of me :-}
I read ?expand.grid carefully, went to ?combn and ?choose but still couldn't see an easy way to get what the OP asked for. The neatest I can get (which isn't very neat!) is: > myVec <- c(1,2,3) > eg <- expand.grid(myVec, myVec) > eg[eg[,1] <= eg[,2],] Var1 Var2 1 1 1 4 1 2 5 2 2 7 1 3 8 2 3 9 3 3 What am I missing? Best regards, KJ "Jeff Newmiller" <jdnew...@dcn.davis.ca.us> wrote in message news:80cc9ff9-d867-4dfc-b6e3-9c1df7822...@email.android.com... > You could read the help for expand.grid very carefully for the answer to > this question. > --------------------------------------------------------------------------- > Jeff Newmiller The ..... ..... Go > Live... > DCN:<jdnew...@dcn.davis.ca.us> Basics: ##.#. ##.#. Live > Go... > Live: OO#.. Dead: OO#.. Playing > Research Engineer (Solar/Batteries O.O#. #.O#. with > /Software/Embedded Controllers) .OO#. .OO#. > rocks...1k > --------------------------------------------------------------------------- > Sent from my phone. Please excuse my brevity. > > Antje Niederlein <niederlein-rs...@yahoo.de> wrote: > >>Hi there, >> >>I have a vector and would like to create a data frame, which contains >>all unique combination of two elements, regardless of order. >> >>myVec <- c(1,2,3) >> >>what expand.grid does: >> >>1,1 >>1,2 >>1,3 >>2,1 >>2,2 >>2,3 >>3,1 >>3,2 >>3,3 >> >>what I would like to have >> >>1,1 >>1,2 >>1,3 >>2,2 >>2,3 >>3,3 >> >>Can anybody help? >> >>______________________________________________ >>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.
