> newmat <- oldmat[ c(rep(FALSE,19),TRUE), ] Or
> newmat <- oldmat[ seq(20, nrow(oldmat), 20), ] -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.s...@imail.org 801.408.8111 > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r- > project.org] On Behalf Of li li > Sent: Tuesday, October 12, 2010 2:00 PM > To: r-help > Subject: [R] extract rows of a matrix > > 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.
