# combinations between two vectors

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## combinations between two vectors

 Hi all,I am looking for a function that would give me all the combinations between two vectors.Lets take as example the  test<-seq(1,30000,by=5000) Browse[2]> test [1]     1  5001 10001 15001 20001 25001 I want all the combinations between two times the test... I think this is  called permutation so a function that could do permutation(test,test)and produce the following 1,11,50011,100011,15001.... 3,13,5001...25001,20001,25001,25001 is there such a function ? RegardsAlex         [[alternative HTML version deleted]] ______________________________________________ [hidden email] mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.
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## Re: combinations between two vectors

 I can't quite tell what you want: your example output is either unclear to me or mangled by posting in HTML (please don't). Is expand.grid(test, test) what you want, or partway to what you want? Sarah On Thu, Dec 18, 2014 at 9:56 AM, Alaios via R-help <[hidden email]> wrote: > Hi all,I am looking for a function that would give me all the combinations between two vectors.Lets take as example the > > test<-seq(1,30000,by=5000) > Browse[2]> test > [1]     1  5001 10001 15001 20001 25001 > I want all the combinations between two times the test... I think this is  called permutation so a function that could do permutation(test,test)and produce the following > 1,11,50011,100011,15001.... > 3,13,5001...25001,20001,25001,25001 > is there such a function ? > RegardsAlex > > >         [[alternative HTML version deleted]] > -- Sarah Goslee http://www.functionaldiversity.org______________________________________________ [hidden email] mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.
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## Re: combinations between two vectors

 Depending on what you want, you probably want to start with expand.grid(): # All combinations of test with test > pairs1 <- expand.grid(test, test) > nrow(pairs1) [1] 36 # Exclude cases that differ only in the order of the values # E.g. (1, 5001), but not (5001, 1), also (1, 1), etc are included > pairs2 <- pairs1[pairs1[,1] <= pairs1[,2],] > nrow(pairs2) [1] 21 # Same as pairs2 but (1, 1), etc are not included > pairs3 <- pairs1[pairs1[,1] < pairs1[,2],] > nrow(pairs3) [1] 15 ------------------------------------- David L Carlson Department of Anthropology Texas A&M University College Station, TX 77840-4352 -----Original Message----- From: R-help [mailto:[hidden email]] On Behalf Of Sarah Goslee Sent: Thursday, December 18, 2014 9:06 AM To: Alaios Cc: [hidden email] Subject: Re: [R] combinations between two vectors I can't quite tell what you want: your example output is either unclear to me or mangled by posting in HTML (please don't). Is expand.grid(test, test) what you want, or partway to what you want? Sarah On Thu, Dec 18, 2014 at 9:56 AM, Alaios via R-help <[hidden email]> wrote: > Hi all,I am looking for a function that would give me all the combinations between two vectors.Lets take as example the > > test<-seq(1,30000,by=5000) > Browse[2]> test > [1]     1  5001 10001 15001 20001 25001 > I want all the combinations between two times the test... I think this is  called permutation so a function that could do permutation(test,test)and produce the following > 1,11,50011,100011,15001.... > 3,13,5001...25001,20001,25001,25001 > is there such a function ? > RegardsAlex > > >         [[alternative HTML version deleted]] > -- Sarah Goslee http://www.functionaldiversity.org______________________________________________ [hidden email] mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code. ______________________________________________ [hidden email] mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.
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## Re: combinations between two vectors

 In reply to this post by R help mailing list-2 On 18/12/2014 14:56, Alaios via R-help wrote: > Hi all,I am looking for a function that would give me all the combinations between two vectors.Lets take as example the > > test<-seq(1,30000,by=5000) > Browse[2]> test > [1]     1  5001 10001 15001 20001 25001 > I want all the combinations between two times the test... I think this is  called permutation I think is more likely it is a combination problem. ??combination would have directed you to the solution others have offered (expand.grid) and other things too.   so a function that could do permutation(test,test)and produce the following > 1,11,50011,100011,15001.... > 3,13,5001...25001,20001,25001,25001 > is there such a function ? > RegardsAlex > > > [[alternative HTML version deleted]] > > ______________________________________________ > [hidden email] 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. > > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 2015.0.5577 / Virus Database: 4253/8759 - Release Date: 12/18/14 > -- Michael http://www.dewey.myzen.co.uk______________________________________________ [hidden email] mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.
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## Re: combinations between two vectors

 This post has NOT been accepted by the mailing list yet. In reply to this post by R help mailing list-2 Hi I'm new, sorry that I'm questioning on your question. What is the use of Browse[2]> test for this It shows me ,"Error: object  'Browse' not found" Regards, HR