Dear all: These solutions work beautifully. Many, many thanks. And apologies for my lazy language! I did indeed mean permutations....
Best regards, Brandon --- On Wed, 12/3/08, G. Jay Kerns <[EMAIL PROTECTED]> wrote: > From: G. Jay Kerns <[EMAIL PROTECTED]> > Subject: Re: [R] Create unique sets of 3 from a vector of IDs? > To: "Kingsford Jones" <[EMAIL PROTECTED]> > Cc: r-help@r-project.org > Date: Wednesday, December 3, 2008, 12:12 AM > Dear Kingsford, > > You are quite right, my mistake: > > urnsamples(ID, size = 3, replace = FALSE, ordered = TRUE) > > Thanks. > Jay > > > On Wed, Dec 3, 2008 at 12:04 AM, Kingsford Jones > <[EMAIL PROTECTED]> wrote: > > However, I believe Brandon was trying to get the > permutations of size > > 3, rather than combinations. Dylan provided a > solution including > > repeats. Here's one without: > > > >> library(gtools) > >> permutations(5, 3, LETTERS[1:5]) > > [,1] [,2] [,3] > > [1,] "A" "B" "C" > > [2,] "A" "B" "D" > > [3,] "A" "B" "E" > > [4,] "A" "C" "B" > > [5,] "A" "C" "D" > > [6,] "A" "C" "E" > > [7,] "A" "D" "B" > > [8,] "A" "D" "C" > > [9,] "A" "D" "E" > > [10,] "A" "E" "B" > > [11,] "A" "E" "C" > > [12,] "A" "E" "D" > > [13,] "B" "A" "C" > > [14,] "B" "A" "D" > > [15,] "B" "A" "E" > > [16,] "B" "C" "A" > > [17,] "B" "C" "D" > > [18,] "B" "C" "E" > > [19,] "B" "D" "A" > > [20,] "B" "D" "C" > > [21,] "B" "D" "E" > > [22,] "B" "E" "A" > > [23,] "B" "E" "C" > > [24,] "B" "E" "D" > > [25,] "C" "A" "B" > > [26,] "C" "A" "D" > > [27,] "C" "A" "E" > > [28,] "C" "B" "A" > > [29,] "C" "B" "D" > > [30,] "C" "B" "E" > > [31,] "C" "D" "A" > > [32,] "C" "D" "B" > > [33,] "C" "D" "E" > > [34,] "C" "E" "A" > > [35,] "C" "E" "B" > > [36,] "C" "E" "D" > > [37,] "D" "A" "B" > > [38,] "D" "A" "C" > > [39,] "D" "A" "E" > > [40,] "D" "B" "A" > > [41,] "D" "B" "C" > > [42,] "D" "B" "E" > > [43,] "D" "C" "A" > > [44,] "D" "C" "B" > > [45,] "D" "C" "E" > > [46,] "D" "E" "A" > > [47,] "D" "E" "B" > > [48,] "D" "E" "C" > > [49,] "E" "A" "B" > > [50,] "E" "A" "C" > > [51,] "E" "A" "D" > > [52,] "E" "B" "A" > > [53,] "E" "B" "C" > > [54,] "E" "B" "D" > > [55,] "E" "C" "A" > > [56,] "E" "C" "B" > > [57,] "E" "C" "D" > > [58,] "E" "D" "A" > > [59,] "E" "D" "B" > > [60,] "E" "D" "C" > > > > > > Kingsford Jones > > > > > > On Tue, Dec 2, 2008 at 9:41 PM, G. Jay Kerns > <[EMAIL PROTECTED]> wrote: > >> Dear Brandon, > >> > >> On Tue, Dec 2, 2008 at 10:46 PM, Dylan Beaudette > >> <[EMAIL PROTECTED]> wrote: > >>> On Tue, Dec 2, 2008 at 7:42 PM, philozine > <[EMAIL PROTECTED]> wrote: > >>>> Dear all: > >>>> > >>>> This is one of those "should be > easy" problems that I'm having great difficulty > solving. I have a vector containing ID codes, and I need to > generate a 3-column matrix that contains all possible > combinations of three. > >>>> > >>>> For example, my ID vector looks like this: > >>>> A > >>>> B > >>>> C > >>>> D > >>>> E > >>>> > >>>> I need to generate a matrix that looks > like this: > >>>> A B C > >>>> A B D > >>>> A B E > >>>> A C B > >>>> A C D > >>>> A C E > >>>> A D B > >>>> A D C > >>>> A D E > >>> > >>> Hi, > >>> > >>> Does this do what you want? > >>> > >>> expand.grid(letters[1:5], letters[1:5], > letters[1:5]) > >>> > >>> > >>> D > >>> > >> > >> > >> Have a look at urnsamples() in the prob package. > >> > >> ID <- LETTERS[1:5] > >> urnsamples(ID, size = 3, replace = FALSE, ordered > = FALSE) > >> > >> Best, > >> Jay > >> > >> > >> > >> > >> > *************************************************** > >> G. Jay Kerns, Ph.D. > >> Associate Professor > >> Department of Mathematics & Statistics > >> Youngstown State University > >> Youngstown, OH 44555-0002 USA > >> Office: 1035 Cushwa Hall > >> Phone: (330) 941-3310 Office (voice mail) > >> -3302 Department > >> -3170 FAX > >> E-mail: [EMAIL PROTECTED] > >> http://www.cc.ysu.edu/~gjkerns/ > >> > >> ______________________________________________ > >> 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. > >> > > > > > > -- > > *************************************************** > G. Jay Kerns, Ph.D. > Associate Professor > Department of Mathematics & Statistics > Youngstown State University > Youngstown, OH 44555-0002 USA > Office: 1035 Cushwa Hall > Phone: (330) 941-3310 Office (voice mail) > -3302 Department > -3170 FAX > E-mail: [EMAIL PROTECTED] > http://www.cc.ysu.edu/~gjkerns/ > > ______________________________________________ > 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.
