Hannah, a <- matrix(rnorm(10000),nrow=500) new.matrix <- a[seq(0,dim(a)[1],by=20),]
Jonathan On Tue, Oct 12, 2010 at 1:59 PM, li li <hannah....@gmail.com> wrote: > Hi all, > I want to extract every 20th row of a big matrix, say 10000 by 1000. > What is the simper way to do this? > Thank you very much! > Hannah > > [[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.
