You could perhaps do it like that a<-a[c(1,2,4,3),]
B. Zhang Yanwei - Princeton-MRAm wrote: > > Hi all, > I have a 4 by 4 matrix, and I want to switch row 2 and row 3 first, then > switch column 2 and column 3. Is there an easy way to do it? > The following is a tedious way to get what I want. But I wonder if there > is a way to simplify this. > > > a=matrix(rnorm(16),4,4) >> a > [,1] [,2] [,3] [,4] > [1,] 0.33833811 -0.9422273 -0.06181611 -1.8346134 > [2,] -0.68167996 0.2004836 0.71079887 -1.1590184 > [3,] 0.07811688 0.1338694 -1.61262688 0.2988365 > [4,] 0.21869786 -1.6356661 -0.13694344 -1.2121355 >> b=a >> b[2,]=a[3,] >> b[3,]=a[2,] >> b > [,1] [,2] [,3] [,4] > [1,] 0.33833811 -0.9422273 -0.06181611 -1.8346134 > [2,] 0.07811688 0.1338694 -1.61262688 0.2988365 > [3,] -0.68167996 0.2004836 0.71079887 -1.1590184 > [4,] 0.21869786 -1.6356661 -0.13694344 -1.2121355 >> c=b >> c[,2]=b[,3] >> c[,3]=b[,2] >> c > [,1] [,2] [,3] [,4] > [1,] 0.33833811 -0.06181611 -0.9422273 -1.8346134 > [2,] 0.07811688 -1.61262688 0.1338694 0.2988365 > [3,] -0.68167996 0.71079887 0.2004836 -1.1590184 > [4,] 0.21869786 -0.13694344 -1.6356661 -1.2121355 > > > Sincerely, > Yanwei Zhang > Department of Actuarial Research and Modeling > Munich Re America > Tel: 609-275-2176 > Email: [EMAIL PROTECTED]<mailto:[EMAIL PROTECTED]> > > > [[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. > > ----- The art of living is more like wrestling than dancing. (Marcus Aurelius) -- View this message in context: http://www.nabble.com/Switch-two-rows-in-a-matrix-tp18872329p18872790.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.
