Construct a permutation matrix from two vectors

Hi,

If I have two vectors:

a = [1 ; 2 ; 3];
b = [4 ; 5 ; 6];

How can I constrcut a matrix that has the shape of:

Thanks.

Answer 1

[Matt J]

a = [1 ; 2 ; 3];
b = [4 ; 5 ; 6];

[B,A]=ndgrid(b,a);

c=[A(:),B(:)]

c = 9×2

1 4 1 5 1 6 2 4 2 5 2 6 3 4 3 5 3 6

Answer 2

[Bruno Luong]

combinations, new stock function in R2023a

a = [1 ; 2 ; 3];
b = [4 ; 5 ; 6];

combinations(a,b)

ans = 9×2 table
    a    b
    _    _

    1    4
    1    5
    1    6
    2    4
    2    5
    2    6
    3    4
    3    5
    3    6