Here's one way: > data.frame(rowID=as.vector(row(A)), colID=as.vector(col(A)), A=as.vector(A)) rowID colID A 1 1 1 1 2 2 1 2 3 1 2 3 4 2 2 4 5 1 3 5 6 2 3 6 7 1 4 7 8 2 4 8
You can sort that as desired. Sarah On Sun, Jan 1, 2012 at 5:21 PM, Ana <rrast...@gmail.com> wrote: > How can I extract a list of the positions in the matrix? >> A=matrix(1:8, nrow=2,ncol=4) >> A > [,1] [,2] [,3] [,4] > [1,] 1 3 5 7 > [2,] 2 4 6 8 > > > Something like this > > pos.A > > 1 1 > 1 2 > 1 3 > 1 4 > 2 1 > 2 2 > 2 3 > 2 4 > -- Sarah Goslee http://www.functionaldiversity.org ______________________________________________ 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.
