Generate all possible combinations of the elements of some vectors (Cartesian product)

Question

I would like to generate all the possible combinations of the elements of a given number of vectors.

For example, for [1 2], [1 2] and

Answer 1

we can also use the 'combvec' instruction in matlab

    no_inp=3 % number of inputs we want...in this case we have 3 inputs                  
    a=[1 2 3]
    b=[1 2 3]
    c=[1 2 3]

    pre_final=combvec(c,b,a)';
    final=zeros(size(pre_final));

    for i=1:no_inp
    final(:,i)=pre_final(:,no_inp-i+1);
    end
    final 

Hope it helps. Good luck.