MATLAB: I need to manipulate this matrix

Question

A=[10 20 30 40;50 60 70 80;90 100 110 120]

%I need to order each rows vertically like that;

B=[10;20;30;40;50;60;70;80;90;100;110;120]

Answer 1

 B = reshape(A',1,[]);

Alternatively:

 B = A';
 B = B(:);