How to concatenate this matrix?

I want to concatenate this "A" matrix vertically. How to do that?I can do that manually. But I want to do it with a loop or in a vectorized way.

A=[1     4     7    10    13    16    19    22    25;
     2     5     8    11    14    17    20    23    26;
     3     6     9    12    15    18    21    24    27]
output=[A(:,1:3);A(:,4:6);A(:,7:9)] % But I want to do it with a loop or in a vectorized way. 

My expected output:

output:[1 4 7;
    2 5 8;
    3 6 9;
    10 13 16;
    11 14 17;
    12 15 18;
    19 22 25;
    20 23 26;
    21 24 27]

Answer 1

[Stephen23]

A = [1,4,7,10,13,16,19,22,25;2,5,8,11,14,17,20,23,26;3,6,9,12,15,18,21,24,27]

A = 3×9

1 4 7 10 13 16 19 22 25 2 5 8 11 14 17 20 23 26 3 6 9 12 15 18 21 24 27

B = reshape(permute(reshape(A,3,3,[]),[1,3,2]),[],3)

B = 9×3

1 4 7 2 5 8 3 6 9 10 13 16 11 14 17 12 15 18 19 22 25 20 23 26 21 24 27