arranging a matrix data

i have matrix A (12x1) as ---

 A =

     6
     5
     3
     4
     8
     4
     6
     7
     5
     2
     3
     6
     8
     9
     8

I want to write a code such that matrix Ao will be again (12x1) but its (1st, 4th, 7th , 10th,13th), (2nd, 5th, 8th,11th, 14th) and (3rd, 6th, 9th, 12th, 15 th) will get together. e.g. Ao =

     6
     4
     6
     2
     8
     5
     8
     7
     3
     9
     3
     4
     5
     6
     8

Answer 1

[Vishal Rane]

There will offcourse be a smarter way to do this, but to get you started:

Ao = [];

Interval = 3;

for i = 1 : Interval 

   Ao = [Ao ; A(i:Interval:end)]; 

end

here 3 is the interval you need.

Answer 2

[Andrei Bobrov]

Ao = reshape(reshape(A,3,[])',[],1);