Thanks Uwe, I was happy that my 2 lines gave what the OP asked for, albeit in a different order.
My puzzlement arose from Jeff Newmillers comment: > You could read the help for expand.grid very carefully for the answer to > this question. ... which I reas as saying that ?expand.grid would lead to a solution. I used "[", which I couldn't see suggested on ?expand.grid. I thought I'd missed a neater solution in the help pages, and hoped someone could point it out. Best regards, Keith Jewell ------------------------------ "Uwe Ligges" <lig...@statistik.tu-dortmund.de> wrote in message news:4ef1ec69.2080...@statistik.tu-dortmund.de... > > > On 21.12.2011 14:39, Keith Jewell wrote: >> 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? > > You are just using a different order - sort accoriding to Var1... > > Best, > Uwe Ligges > >> >> 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. > ______________________________________________ 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.
