hi all, how can I create sequences that start from a known vector, say x1 and end with another say x2- also suppose all the sequences will be the same length. I don't want to use a for loop x1<-c(1,2,3,4); x2<-(3,4,5,6); what I want is 1 2 3 4 2 3 4 5 3 4 5 6 Thanks ----- Yasir H. Kaheil Columbia University -- View this message in context: http://www.nabble.com/create-sequences-from-two-%22from%22-and-%22to%22-vectors-tp21380194p21380194.html Sent from the R help mailing list archive at Nabble.com.
Dimitris Rizopoulos
2009-Jan-09 20:47 UTC
[R] create sequences from two "from" and "to" vectors
one way is using mapply(), e.g.,
mapply(":", 1:4, 3:6)
I hope it helps.
Best,
Dimitris
Yasir Kaheil wrote:> hi all,
> how can I create sequences that start from a known vector, say x1 and end
> with another say x2- also suppose all the sequences will be the same
length.
> I don't want to use a for loop
> x1<-c(1,2,3,4); x2<-(3,4,5,6);
> what I want is
> 1 2 3 4
> 2 3 4 5
> 3 4 5 6
>
> Thanks
>
> -----
> Yasir H. Kaheil
> Columbia University
--
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus Medical Center
Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
Fax: +31/(0)10/7043014
on 01/09/2009 02:42 PM Yasir Kaheil wrote:> hi all, > how can I create sequences that start from a known vector, say x1 and end > with another say x2- also suppose all the sequences will be the same length. > I don't want to use a for loop > x1<-c(1,2,3,4); x2<-(3,4,5,6); > what I want is > 1 2 3 4 > 2 3 4 5 > 3 4 5 6 > > Thanks> mapply(seq, x1, x2)[,1] [,2] [,3] [,4] [1,] 1 2 3 4 [2,] 2 3 4 5 [3,] 3 4 5 6 See ?mapply HTH, Marc Schwartz
Try:> mapply( seq, from=1:4, to=7:10 )[,1] [,2] [,3] [,4] [1,] 1 2 3 4 [2,] 2 3 4 5 [3,] 3 4 5 6 [4,] 4 5 6 7 [5,] 5 6 7 8 [6,] 6 7 8 9 [7,] 7 8 9 10 Is that what you want? -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.snow at imail.org 801.408.8111> -----Original Message----- > From: r-help-bounces at r-project.org [mailto:r-help-bounces at r- > project.org] On Behalf Of Yasir Kaheil > Sent: Friday, January 09, 2009 1:43 PM > To: r-help at r-project.org > Subject: [R] create sequences from two "from" and "to" vectors > > > hi all, > how can I create sequences that start from a known vector, say x1 and > end > with another say x2- also suppose all the sequences will be the same > length. > I don't want to use a for loop > x1<-c(1,2,3,4); x2<-(3,4,5,6); > what I want is > 1 2 3 4 > 2 3 4 5 > 3 4 5 6 > > Thanks > > ----- > Yasir H. Kaheil > Columbia University > -- > View this message in context: http://www.nabble.com/create-sequences- > from-two-%22from%22-and-%22to%22-vectors-tp21380194p21380194.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help at 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.