[R] expand.grip for permutations

[R. Michael Weylandt]

On Wed, Oct 31, 2012 at 8:18 PM, trekvana <trekvana at aol.com> wrote:
> if i were to have a block size of 4 people and i want to assign a treatment
> combination to the entire block, there would be 16 different treatment
> combinations (TTTT, TTTP, TTPP, PTTP, etc.)
>
> i am trying to get all 16 permutations and i am able to use this code below.
>
> drugs=c('P','T');
> comb=expand.grid(drugs,drugs,drugs,drugs)

do.call(expand.grid, rep(list(drugs),n))

where n is 3,4,5...

Cheers,
Michael

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