MATLAB: How to augment a vector into another vector

Question

v1 = [0 1 2 3], 
v2 = [0 1 2]

the resultant

v3 =[0 0;
1 0;
2 0;
3 0;
0 1;
1 1;
2 1;
3 1;
0 2;
1 2;
2 2;
3 2]

Answer 1

v1 = [0 1 2 3], 
v2 = [0 1 2]
[a,b]=ndgrid(v1,v2)
out=[a(:) b(:)]