How to create a block diagonal matrix without using cell array?

I currently have a [m x n x p] matrix. I would like to create a block diagonal consisting of [m x n] matrices for each diagonal component.

i.e.

A(:,:,1) = [1 2 3 ; 4 5 6];

A(:,:,2) = [7 8 9 ; 10 11 12];

B = [ 1 2 3 0 0 0 ;

4 5 6 0 0 0 ;

0 0 0 7 8 9;

0 0 0 10 11 12];

Is there an efficient way to do this without using a cell array ?

Thank you in advance.

Answer 1

[Andrei Bobrov]

A(:,:,1) = [1 2 3 ; 4 5 6];
A(:,:,2) = [7 8 9 ; 10 11 12];

C = num2cell(A,[1,2]);
B = blkdiag(C{:});

or for your case (A - matrix 3d):

[m,n,k] = size(A);
B = kron(eye(k),ones(m,n));
B(B > 0) = A;

[Thanacha Choopojcharoen]

Works Perfectly. Thank you so much !!!