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
or a lot faster: mat[nrow(mat):1, ] Uwe Ligges > ------------------------------------------------------------------- > 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.