Hi:
Try this:
abc<-cbind(c(1,6,2),c(2,5,3),c(3,2,1))
abc[order(abc[, 1], decreasing = TRUE), ]
[,1] [,2] [,3]
[1,] 6 5 2
[2,] 2 3 1
[3,] 1 2 3
HTH,
Dennis
On Wed, Apr 6, 2011 at 3:35 AM, Yan Jiao <y.j...@ucl.ac.uk> wrote:
> Dear All
>
> I'm trying to sort a matrix using function order,
> Some thing really odd:
>
> e.g.
> abc<-cbind(c(1,6,2),c(2,5,3),c(3,2,1))## matrix I want to sort
>
> if I do
> abc[ order(abc[,3]), increasing = TRUE]
>
> the result is correct
> [,1] [,2] [,3]
> [1,] 2 3 1
> [2,] 6 5 2
> [3,] 1 2 3
>
> But if I want to sort in decresing order:
> abc[ order(abc[,3]), decreasing = TRUE]
>
> the result is wrong
> [,1] [,2] [,3]
> [1,] 2 3 1
> [2,] 6 5 2
> [3,] 1 2 3
>
> Also if I use
> abc[ order(abc[,3]), increasing = FALSE]
> it returns nothing
> [1,]
> [2,]
> [3,]
>
> Why is that?
>
>
> Many thanks
>
> Yan
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
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