> Date: Mon, 14 Sep 2009 10:32:09 -0500 > From: Peng Yu <pengyu...@gmail.com> > > Hi, > > x=matrix(1:60,nr=6) > > I can refer the last 2 rows by > x[5:6,] > > If I don't know the total number of rows is 6, is there a way to refer
But R does known the total number of rows: it's NROW(x) -- or nrow(x) if you are sure 'x' is a matrix HTH, Giovanni > the last 2 rows? > > Regards, > Peng > > ______________________________________________ > 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. > > -- Giovanni Petris <gpet...@uark.edu> Associate Professor Department of Mathematical Sciences University of Arkansas - Fayetteville, AR 72701 Ph: (479) 575-6324, 575-8630 (fax) http://definetti.uark.edu/~gpetris/ ______________________________________________ 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.