
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: smartpink111@yahoo.com
> Subject: Re: [R] splitting matrices
> To: macqueen1@llnl.gov
> CC: eliza_botto@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" <macqueen1@llnl.gov>
> To: eliza botto <eliza_botto@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_botto@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]]
> >
> >______________________________________________
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> >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
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
 		 	   		  
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