Hello
for vectors, use rev() For matrices and arbitrary-dimensioned arrays, use arev() of the magic package: > library(magic) > b <- matrix(1:9,3,3) > b [,1] [,2] [,3] [1,] 1 4 7 [2,] 2 5 8 [3,] 3 6 9 > arev(b) [,1] [,2] [,3] [1,] 9 6 3 [2,] 8 5 2 [3,] 7 4 1 > On 23 Oct 2007, at 11:45, Rainer M Krug wrote: > Hi > > I have a vector > > x <- c(1, 2, 3, 4, 5) > > and I want to "flip" it around, i.e. I need > > 5, 4, 3, 2, 1 > > Is there a ssolution apart from > > y <- x[length(x):1] > > > I am also looking for the same for a matrix M, i.e. > > 1 2 3 > 4 5 6 > 7 8 9 > > should become > > 7 8 9 > 4 5 6 > 1 2 3 > > again, I am using > > M[1:dim(M)[1], dim(M)[2]:1] > > > Thanks > > Rainer > > ______________________________________________ > 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. -- Robin Hankin Uncertainty Analyst National Oceanography Centre, Southampton European Way, Southampton SO14 3ZH, UK tel 023-8059-7743 ______________________________________________ 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.