Dear Tal,
It works as it should. In this code:

# Data
aa <- c(3, 1 ,2 )
aa
[1] 3 1 2

aa[aa]
[1] 2 3 1

you are telling R to do the following:  take the vector aa and select the
elements aa (in R language that is aa[aa]). If you look carefully, the third
element of aa is 2, the first is 3 and the second is 1.

Perhaps I'm missing something but, to me, it works as expected.  What would
you like to get?

HTH,

Jorge


On Sat, Mar 28, 2009 at 1:48 PM, Tal Galili <tal.galili@gmail.com> wrote:

> Hello people.
>
> I wish to reorder a simple vector of numbers by another vector of the order
> (and then do the same, but with a data frame rows)
>
> I try this (which doesn't work) :
> > aa <- c(3, 1 ,2 )
> > aa[aa]
> [1] 2 3 1
>
> The same won't work if I try to order a data frame:
> > data.frame(matrix(c(3,1,2), 3,2))[c(3,1,2),]
>  X1 X2
> 3  2  2
> 1  3  3
> 2  1  1
>
>
> How should I do this?
>
>
> p.s: sorry if the question is too simple, but I couldn't find a good
> explanation for this on google.
> p.p.s: I am running R 2.8
>
>
> Thanks,
> Tal
>
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>
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