Generate all possible permutations (or n-tuples)

Question

I\'d like to create a data.frame of all possible permutations of 10 variables that can be either 1 or 2

2*2*2*2*2*2*2*2*2*2 = 1024 # possible

1,1,1,1,1,1,1,         


        

Answer 1

how about this:

tmp = expand.grid(1:2,1:2,1:2,1:2,1:2,1:2,1:2,1:2,1:2,1:2)

or this (thanks Tyler):

x <- list(1:2)
tmp = expand.grid(rep(x, 10))

Answer 2

Some people have asked the question regarding letters, such as here. The expand.grid solution is usually given, but I find this to be much simpler:

sapply(LETTERS[1:3], function(x){paste0(x, LETTERS[1:3])}) %>% c()
# [1] "AA" "AB" "AC" "BA" "BB" "BC" "CA" "CB" "CC"