Try this: a <- mvrnorm(100, m, c)
On Wed, Jan 27, 2010 at 9:50 AM, ayu2008 <ayuaz...@yahoo.com> wrote: > > > Hi dear users, > > I try to split a matrix into a few matrices, for example, suppose that I > have 1000X4 matrix from mvrnorm(1000,m,c) with > > m<-matrix(c(0,0,0,2),4,1) and > c<-matrix(c(1.0,0.2,-0.5,0.3,0.2,1,0.2,-0.5,-0.5,0.2,1,0.2,0.3,-0.5,0.2,1),4,4,byrow=T) > > > How to split the matrix into > > a. 2 matrices which the first one consists of the first 500 rows, and the > second one consist of the last 500 rows split(as.data.frame(a), rep(1:2, each = 500)) > > b. split the matrix equally and sequentially (according to the order of the > rows) into say 10 matrices with 100 x 4 dimension split(as.data.frame(a), rep(1:100, each = 10)) > c. how to do (b) randomly, not following the order of the rows, but without > any overlapping. So all the 10 matrices will consists of different values > from the original matrix. split(as.data.frame(a)[sample(1:nrow(a)),], rep(1:10, each = 10)) > Your help is very much appreciated....thank you > > > ayu > -- > View this message in context: > http://n4.nabble.com/How-to-split-a-matrix-into-a-few-matrices-tp1311535p1311535.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O ______________________________________________ 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.