How do I create a vector by repeating a vector

Given a Vector A=[1; 2], I want to create a vector B, such that B=[1; 2; 1; 2] . Thanks

Answer 1

[KSSV]

A = [1; 2] ;
B = repmat(A,2,1)

B = 4×1

1 2 1 2

[Onovo]

Thanks pal

[darova]