MATLAB: How can i combine two different matrics with different size become one matric that fixed size

Question

according to my question how can i combine two different matrics with different size become one matric that fixed size ex :

A = [1,2,3,4,5]

B = [1,2,3,4,5,6,7,8]

becoming one matric that fixed size 1×15

C = [1,2,3,4,5,1,2,3,4,5,6,7,8,0,0]

or

A = [1,2,3,4,5]

B = [1,2,3,4,5,6,7,8,9,10]

becoming one matric that fixed size 1×15

C = [1,2,3,4,5,1,2,3,4,5,6,7,8,9,10]

Answer 1

C=zeros(1,15);
C(1:numel(A)+numel(B))=[A B]