MATLAB: All possible combinations of n pairs of 2 elements from 2 vectors of n elements without repetition of the elements

Question

I have two vectors of n elements (both the same n) e.g. x=[1 2 3] y=[4 5 6]

I would like an "easy" way to get all the possible combinations of n pairs of 2 elements (one from each vector) without repeating any element, and place them in a matrix.

It's difficult for me to explain it but let's see an example.

From these two vectors x=[1 2 3] y=[4 5 6] I'd like get a matrix with the following rows (the order of them doesn't matter):

1 4 2 5 3 6

1 4 2 6 3 5

1 5 2 4 3 6

1 5 2 6 3 4

1 6 2 4 3 5

1 6 2 5 3 4

It should work with any length of x and y (n)

Thank you in advance

Answer 1

 p = perms(y);
 [m,n] = size(p);
 z = zeros(m,2*n);
 z(:,1:2:end-1) = repmat(x,m,1);
 z(:,2:2:end) = p;

This assumes the elements of x are not permuted in z, just as in your example.