On Wed, Mar 7, 2012 at 2:41 PM, Ajay Askoolum <aa2e...@yahoo.co.uk> wrote: > Thank you. Yes, I did look at the help but could not get my expressions to > work. > > You used a data.frame with thematrix values I gave. Your solution also works > when dealing with a matrix (this my be obvious to seasoned R users, but was > no to me).
Well, if you don't provide a reproducible example, you get replies that reflect however the respondent interpreted your question. You can easily fix that by providing a reproducible example. But nowhere in ?order does it say anything about working only on data frames, so I'm not sure why you would think that. Sarah >> x<-matrix(c(57,91,31,61,16,84,3,99,85,47,21,6,57,91,31,61,16,84,3,99), >> ncol=5, byrow=TRUE) >> #order by row >> order(x[,1]) > [1] 3 1 4 2 >> x[order(x[,1]),] > [,1] [,2] [,3] [,4] [,5] > [1,] 21 6 57 91 31 > [2,] 57 91 31 61 16 > [3,] 61 16 84 3 99 > [4,] 84 3 99 85 47 >> #order by column >> order(x[1,]) > [1] 5 3 1 4 2 >> x[,order(x[1,])] > [,1] [,2] [,3] [,4] [,5] > [1,] 16 31 57 61 91 > [2,] 47 99 84 85 3 > [3,] 31 57 21 91 6 > [4,] 99 84 61 3 16 >> > ______________________________________________ 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.
