Another approach is: mat[nrow(mat):1, ]
Patrick Burns [EMAIL PROTECTED] +44 (0)20 8525 0696 http://www.burns-stat.com (home of S Poetry and "A Guide for the Unwilling S User") Jacques VESLOT wrote: > > mat <- matrix(1:16,4,4) > > mat > [,1] [,2] [,3] [,4] >[1,] 1 5 9 13 >[2,] 2 6 10 14 >[3,] 3 7 11 15 >[4,] 4 8 12 16 > > apply(mat,2,rev) > [,1] [,2] [,3] [,4] >[1,] 4 8 12 16 >[2,] 3 7 11 15 >[3,] 2 6 10 14 >[4,] 1 5 9 13 > >------------------------------------------------------------------- >Jacques VESLOT > >CNRS UMR 8090 >I.B.L (2ème étage) >1 rue du Professeur Calmette >B.P. 245 >59019 Lille Cedex > >Tel : 33 (0)3.20.87.10.44 >Fax : 33 (0)3.20.87.10.31 > >http://www-good.ibl.fr >------------------------------------------------------------------- > > >[EMAIL PROTECTED] a écrit : > > >>Hello, >> >>I'm an absolut beginner with R and now I got a 2D vector with numbers. I >>would like to mirror this vector now by the rows (so that the first row >>becomes last, second becomes one before last, ...). >>I don't know if there is any method I can use to do this. >>Could you please help me? >> >>Antje >> >> >>--------------------------------- >>Was Sie schon immer wissen wollten aber nie zu Fragen trauten? Yahoo! Clever >>hilft Ihnen. >> [[alternative HTML version deleted]] >> >>______________________________________________ >>R-help@stat.math.ethz.ch 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@stat.math.ethz.ch 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@stat.math.ethz.ch 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.