Hi what about
rbind(a,a) [,1] [,2] [,3] [,4] [1,] 1 2 3 4 [2,] 5 6 7 8 [3,] 1 2 3 4 [4,] 5 6 7 8 Regards Petr > > > a <- matrix(1:8, 2, 4, byrow=TRUE) > > a > [,1] [,2] [,3] [,4] > [1,] 1 2 3 4 > [2,] 5 6 7 8 > > a[c(1,2,1,2),] > [,1] [,2] [,3] [,4] > [1,] 1 2 3 4 > [2,] 5 6 7 8 > [3,] 1 2 3 4 > [4,] 5 6 7 8 > > > > On Wed, Apr 25, 2012 at 8:32 PM, Rebecca <rebecca0...@yahoo.cn> wrote: > > > Hi, > > If I have a matrix like > > 1 2 3 4 > > 5 6 7 8, > > how can I repeat two rows as whole, to be like > > 1 2 3 4 > > 5 6 7 8 > > 1 2 3 4 > > 5 6 7 8? > > > > Since I have more two rows in a matrix and I need to repeat many times, I > > wonder whether there is a convenient command to do so. > > > > Thanks! > > [[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<http://www.r-project.org/ > posting-guide.html> > > and provide commented, minimal, self-contained, reproducible code. > > > > > > [[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.