[R] expand.grip for permutations

[trekvana]

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)

for a block size of 3 the code would be comb=expand.grid(drugs,drugs,drugs)
and for a block size of 2 it would be comb=expand.grid(drugs,drugs).

my question is whether there is a way to automatically create the comb
variable. i tried using expand.grid(rep(drugs, block.size) but that didn't
work.

any help on how i can proceed? thanks



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