MATLAB: How to combine two matrices

combine matrix

A = [1 2 3; 4 5 6; 7 8 9] B = [10 11 12; 13 14 15]

C = [1 2 3; 4 5 6; 7 8 9; 10 11 12; 13 14 15]

C=[A;B]

C=vertcat(A,B)

C=repmat(1:21,12,1)
C=C(:)'

%or

C=1:21;
C=reshape(C(ones(12,1),:),1,[])

myArray = [1 2 3; 4 5 6; 7 8 9; 10 11 12; 13 14 15];
result = myArray( [1 3 4], : );