Dear Arun, David, Bert and Macqueen,thankyou very much for your replies and your kind suggestions have been noted.thanks once again elisa
> Date: Thu, 3 Jan 2013 09:12:11 -0800 > From: smartpink...@yahoo.com > Subject: Re: [R] splitting matrices > To: macque...@llnl.gov > CC: eliza_bo...@hotmail.com; r-help@r-project.org > > Hi, > You could also try: > set.seed(51) > mat1<-matrix(sample(1:5000,1116*12,replace=TRUE),nrow=1116) > dim(mat1) > #[1] 1116 12 > > res1<-lapply(split(as.data.frame(mat1),rep(1:36,each=31)),as.matrix) > unlist(lapply(res1,nrow)) > # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 > 26 > #31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 31 > 31 > #27 28 29 30 31 32 33 34 35 36 > #31 31 31 31 31 31 31 31 31 31 > > A.K. > > > > > ----- Original Message ----- > From: "MacQueen, Don" <macque...@llnl.gov> > To: eliza botto <eliza_bo...@hotmail.com>; "r-help@r-project.org" > <r-help@r-project.org> > Cc: > Sent: Thursday, January 3, 2013 11:56 AM > Subject: Re: [R] splitting matrices > > This example illustrates a method that may do what you want. > > ## split a 20x5 matrix into five 4x5 matrices > xmat <- matrix(1:100, nrow=20, ncol=5, byrow=TRUE) > xsplit <- rep( 1:5, times= rep(4,5)) > tmp <- split.data.frame(xmat,xsplit) > > You will need to change xsplit to fit your dimensions. > > -Don > > > -- > Don MacQueen > > Lawrence Livermore National Laboratory > 7000 East Ave., L-627 > Livermore, CA 94550 > 925-423-1062 > > > > > > On 1/3/13 8:40 AM, "eliza botto" <eliza_bo...@hotmail.com> wrote: > > > > > > >Dear useRs, > >i want to split a matrix having 1116rows and 12 columns. i want to split > >that matrix into 36 small matrices each having 12 columns and 31 rows. > >The big matrix should be splitted row wise. which means that the first > >small matrix should copy values which are in first 31 rows and 12 columns > >of the big matrix. similarly 2nd small matrix should contain values from > >32nd to 63rd row of the big matrix and so on. on the whole i want to have > >36 small matrices.i tried > >dim(dd) <- c(31,12,35) > >but the result are not stisfactory... > >thanks in advance > >elisa > > [[alternative HTML version deleted]] > > > >______________________________________________ > >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. > [[alternative HTML version deleted]] ______________________________________________ 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.
