MATLAB: Extract a double array to multiple arrays

Question

I have a double array

aa = [1, 2, 3, 4, 11,12, 13, 14, 21, 22, 23, 24] 

How can I get 3 arrays

b1 = [1, 11, 21] 
b2 = [2, 12, 22]
b3 = [3, 13, 23] 
b4 = [4, 14, 24]

Thanks!

Answer 1

b1=aa(1:4:end);
b2=aa(2:4:end);
b3=aa(3:4:end);
b4=aa(4:4:end);