[R] order()

[E. D. Isaia]

If it helps:

> x<-c(5,6,7,4,3,2,1)
> y<-x^2
> mydata <- cbind(x,y)
> (mydata <- mydata[order(mydata[,1]),])
     x  y
[1,] 1  1
[2,] 2  4
[3,] 3  9
[4,] 4 16
[5,] 5 25
[6,] 6 36
[7,] 7 49
> x <- mydata[,1]
> y <- mydata[,2]

 Best, isaia.

Ko-Kang Kevin Wang wrote:

> Hi,
>
> In the order() help file, there is an example like:
>      a <- c(4, 3, 2, NA, 1)
>      b <- c(4, NA, 2, 7, 1)
>      z <- cbind(a, b)
>      (o <- order(a, b)); z[o, ]
>
> How can I do something like "order a in ascending order, b in descending
> order"?  And say I have a third vector c, and I'd like to add this to the
> previous condition "a ascending, b descending, c descending".  How can I
> do this?
>
> Thanks,
>
> Ko-Kang Wang
>
> ------------------------------------------------------------------------------
> Ko-Kang Kevin Wang
> Postgraduate PGDipSci Student
> Department of Statistics
> University of Auckland
> New Zealand
>
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~ Ennio D. Isaia
~ Dep. of Statistics & Mathematics, University of Torino
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