[R] reorder data.frame

[David Winsemius]

On Nov 9, 2011, at 10:14 AM, Johannes Radinger wrote:

> Hello,
>
> I very general question but probably usefull to others as well:
>
> Is there any prebuild function that reorders a dataframe from:
>
>   x1    x2
> 1  100   200
> 2  101   201
> 3  102   202
> 4  103   203
> 5  104   204
> 6  105   205
>
> to
>
> 1  100  x1
> 2  101  x1
> 3  102  x1
> 4  103  x1
> 5  104  x1
> 6  105  x1
> 7  200  x2
> 8  201  x2
> 9  202  x2
> 10  203  x2
> 11  204  x2
> 12  205  x2

?stack

>
> I found a way with:
>
> names <- rep(c("x1","x2"),c(length(x1),length(x2)))
> x <-c(x1,x2)
> data.frame(x,names)

That is basically what stack does.

>
> but probably there is already another function for doing such things  
> more easily.
>
> Thank you
> Johannes
> --
>
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David Winsemius, MD
West Hartford, CT