Alternatively you could use dim(dd) <- c(31, 36, 12)
That will give you an array in which each small matrix is defined as dd[,1:36,] You can work with that directly, or if you want the separate matrices to be represented by the third index: ddd <- aperm(dd, c(1, 3, 2)) ---------------------------------------------- David L Carlson Associate Professor of Anthropology Texas A&M University College Station, TX 77843-4352 > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > project.org] On Behalf Of MacQueen, Don > Sent: Thursday, January 03, 2013 10:57 AM > To: eliza botto; r-help@r-project.org > 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. ______________________________________________ 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.
