Hi again, I am exploring if R can help me to get all possible combinations of members in a group. Let say I have a group with 5 members : A, B, C, D, E Now I want to generate all possible unique combinations with all possible lengths from that group e.g. 1st combination : A 2nd combination : B ..... 5th combination : E 6th combination : A, B 7th combination : B, C .... last combination: A, B, C, D, E Ideally, I have a fairly large group so am looking for some programmatic way to generate all possible combinations. Any help will be highly appreciated. Thanks for your time.

lapply(1:5, function(x) combn(groups, x)) or perhaps unlist(lapply(1:5, function(x) combn(groups, x, FUN = paste, collapse = ", "))) Best, Ista On Wed, Aug 23, 2017 at 11:33 AM, Christofer Bogaso <bogaso.christofer at gmail.com> wrote:> Hi again, > > I am exploring if R can help me to get all possible combinations of > members in a group. > > Let say I have a group with 5 members : A, B, C, D, E > > Now I want to generate all possible unique combinations with all > possible lengths from that group e.g. > > 1st combination : A > 2nd combination : B > ..... > 5th combination : E > 6th combination : A, B > 7th combination : B, C > .... > last combination: A, B, C, D, E > > Ideally, I have a fairly large group so am looking for some > programmatic way to generate all possible combinations. > > Any help will be highly appreciated. > > Thanks for your time. > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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.

Please at least do a basic internet search before posting here. Searching on "R combinations" brought up the combn() function, which you can use in a simple loop to get your answer:> lapply(seq_len(5), FUN = function(x)combn(LETTERS[1:5], x))## You can use a for() loop if you prefer [[1]] [,1] [,2] [,3] [,4] [,5] [1,] "A" "B" "C" "D" "E" [[2]] [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [1,] "A" "A" "A" "A" "B" "B" "B" "C" "C" "D" [2,] "B" "C" "D" "E" "C" "D" "E" "D" "E" "E" [[3]] [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [1,] "A" "A" "A" "A" "A" "A" "B" "B" "B" "C" [2,] "B" "B" "B" "C" "C" "D" "C" "C" "D" "D" [3,] "C" "D" "E" "D" "E" "E" "D" "E" "E" "E" [[4]] [,1] [,2] [,3] [,4] [,5] [1,] "A" "A" "A" "A" "B" [2,] "B" "B" "B" "C" "C" [3,] "C" "C" "D" "D" "D" [4,] "D" "E" "E" "E" "E" [[5]] [,1] [1,] "A" [2,] "B" [3,] "C" [4,] "D" [5,] "E" Cheers, Bert Bert Gunter "The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) On Wed, Aug 23, 2017 at 8:33 AM, Christofer Bogaso <bogaso.christofer at gmail.com> wrote:> Hi again, > > I am exploring if R can help me to get all possible combinations of > members in a group. > > Let say I have a group with 5 members : A, B, C, D, E > > Now I want to generate all possible unique combinations with all > possible lengths from that group e.g. > > 1st combination : A > 2nd combination : B > ..... > 5th combination : E > 6th combination : A, B > 7th combination : B, C > .... > last combination: A, B, C, D, E > > Ideally, I have a fairly large group so am looking for some > programmatic way to generate all possible combinations. > > Any help will be highly appreciated. > > Thanks for your time. > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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.

On Wed, Aug 23, 2017 at 11:33 AM, Christofer Bogaso <bogaso.christofer at gmail.com> wrote:> Hi again, > > I am exploring if R can help me to get all possible combinations of > members in a group. > > Let say I have a group with 5 members : A, B, C, D, E > > Now I want to generate all possible unique combinations with all > possible lengths from that group e.g. > > 1st combination : A > 2nd combination : B > ..... > 5th combination : E > 6th combination : A, B > 7th combination : B, C > .... > last combination: A, B, C, D, E > > Ideally, I have a fairly large group so am looking for some > programmatic way to generate all possible combinations.Be careful, the number of combinations grows pretty quickly. You can calculate the number ahead of time with sum(choose(n, 1:n)) where n is the number of values in your group. --Ista> > Any help will be highly appreciated. > > Thanks for your time. > > ______________________________________________ > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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.