combination from different vectors

Question

I have some vectors like this

V1 = c(1,2,3,4,5)
V2 = c(7,8,9,10,11)
V3 = c(15,16,17,18,19)
V4 = c(3,4,5,6,7)

I would like to get all possible c

Answer 1

If I understand your questions correctly, you are probably looking for expand.grid:

> expand.grid( V1=V1, V2=V2, V3=V3, V4=V4 )[1:5,]
  V1 V2 V3 V4
1  1  7 15  3
2  2  7 15  3
3  3  7 15  3
4  4  7 15  3
5  5  7 15  3
...

This will yield all a data.frame with one row per combination