R:Binary matrix for all possible unique results

Question

How to generate a binary matrix for all possible permutations of \'i\' variables X, where \" i \" can be any number between 1 and infinite. Resultant matrix will have 2^ i u

Answer 1

you can use expand.grid:

 expand.grid(c(0,1),c(0,1))
  Var1 Var2
1    0    0
2    1    0
3    0    1
4    1    1

More generally, with 5 columns for example, giving m:

m <- as.data.frame(matrix(rbinom(5*2, 1, 0.5),ncol=5))
 V1 V2 V3 V4 V5
1  0  1  1  0  0
2  0  1  1  0  0

dim(expand.grid(m))
32 5