How to reshape a matrix?

Suppose I have a 2D matrix (6,3) as follows

A

1 2 3

4 5 6

7 8 9

10 11 12

13 14 15

16 17 18

Now I want to reshape into one 3D matrix (3,3,2) like as follows:

A_3D(:, :, 1)

1 2 3

4 5 6

7 8 9

A_3D(:, :, 2)

10 11 12

13 14 15

16 17 18

How I can achieve that with an efficient way?

Thank you

[VBBV]

 % if true
    % code
 % end
A_3D = reshape(A,3,3,[])

Answer 1

[Ameer Hamza]

Combination of reshape and permute

permute(reshape(A, 3, size(A,1)/3, []), [1 3 2])

[Priyabrata Das]

Thank you Mr. Ameer. This code is working fine for the given example. Suposse I have a 2D matrix of (3N,3) dimension and I want to covert into a 3D matrix of (3,3,N) dimension as per the above mentioned fashion. Will this code work too? If not, then what should be the proper way?

Thank you!

[Ameer Hamza]

See the updated answer.

[Priyabrata Das]

It is working fine. Now I have to understand the logic behind this line of code. Thank you very much.

[Ameer Hamza]

I am glad to be of help. You can run each part one by one and see the output. That will help in understanding.