MATLAB: Reshape multidimensional matrix by page

matrixmultidimensionalreshape

Suppose you have a multidimensional array A: 64x64x16. How do you reshape it efficiently so A(:,:,1) to A(:,:,16) are 64×64 blocks that form a new 256×256 matrix?
The desired result (256 x 256) is:
[A(:,:,1) A(:,:,2) A(:,:,3) A(:,:,4); A(:,:,5) A(:,:,6) A(:,:,7) A(:,:,8); A(:,:,9) A(:,:,10) A(:,:,11) A(:,:,12); A(:,:,13) A(:,:,14) A(:,:,15) A(:,:,16)]

Best Answer

A = rand(64, 64, 16);
B = reshape(permute(reshape(A, 64, 64*4, 4), [1,3,2]), [256, 256]);
C = [A(:,:,1) A(:,:,2) A(:,:,3) A(:,:,4); ...
     A(:,:,5) A(:,:,6) A(:,:,7) A(:,:,8); ...
     A(:,:,9) A(:,:,10) A(:,:,11) A(:,:,12); ...
     A(:,:,13) A(:,:,14) A(:,:,15) A(:,:,16)];
isequal(B, C)
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