I assume you want to sort the whole dataset (matrix) by ordering one column in ascending order (and order all other columns appropriately).
a<-matrix(a<-c(1,3,4,6,6,4,6,56,4,64,86,39,4,2),length(a),2) a #sort by first column a[order(a[,1]),] #sort by second column a[order(a[,2]),] #both give the same result here because the columns are identical HTH, Daniel ------------------------- cuncta stricte discussurus ------------------------- -----Ursprüngliche Nachricht----- Von: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] Im Auftrag von Kajan Saied Gesendet: Thursday, October 08, 2009 12:51 PM An: r-help@r-project.org Betreff: [R] sort (all columns of) a matrix Dear R-Help Team, I have been trying to sort (all columns of) a matrix: > a<-matrix(a<-c(1,3,4,6,6,4,6,56,4,64,86,39,4,2),length(a),2) > a [,1] [,2] [1,] 1 1 [2,] 3 3 [3,] 4 4 [4,] 6 6 [5,] 6 6 [6,] 4 4 [7,] 6 6 [8,] 56 56 [9,] 4 4 [10,] 64 64 [11,] 86 86 [12,] 39 39 [13,] 4 4 [14,] 2 2 > I would like to have the matrix sorted and the output should again be *a matrix* with nrow=length(a) and ncol=2 just like (a) but only sorted. Whatever I try (be it sort(), order()...) I receive a vector of length(a)*2... Could you please help me? Best regards, kajan [[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. ______________________________________________ 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.
