[R] permutate elements in a vector

Berend Hasselman
Thu, 01 Dec 2011 13:05:58 -0000

Wendy wrote
>
> Hi all,
>
> I have a vector, e.g., A = c(10, 20, 30, 40). This 4 numbers have 4! = 24
> different combination. I want to generate a matrix with one combination in
> one row, so the output would be
>
> B =
> 10 20 30 40
> 10 40 20 30
> ...
>
> Does anyone know how to do this easily in R? Thank you very much.
>
> Wendy
>

You want permutations not combinations.

library(e1071)
permutations(4) * 10

or

library(gtools)
A <- 10*(1:4)
permutations(4,4,A)

Berend


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