Efficient way to divide array into tiles

I use the following code to divide array into tiles

n=2;nrow=3;ncol=3;
A=reshape(1:36,6,6)

A = 6×6

1 7 13 19 25 31 2 8 14 20 26 32 3 9 15 21 27 33 4 10 16 22 28 34 5 11 17 23 29 35 6 12 18 24 30 36

A=mat2cell(A,zeros(nrow,1)+n,zeros(ncol,1)+n);
A=reshape(A,1,[]);
A=cellfun(@(x) x(:),A,"UniformOutput",false);
A=cell2mat(A)

A = 4×9

1 3 5 13 15 17 25 27 29 2 4 6 14 16 18 26 28 30 7 9 11 19 21 23 31 33 35 8 10 12 20 22 24 32 34 36

Now each column contains the element of each 2-by-2 tile.

The problem is when A is large and n is small the use of cell array creates significant overhead. Is there a more efficient way to do this?

Answer 1

[Matt J]

Use this FEX download,

https://www.mathworks.com/matlabcentral/fileexchange/115340-block-transposition-permutation-and-reshaping-of-arrays

A=blkColonTranspose(A,[2,2]);
A=reshape(A,4,[]);

[Yi-xiao Liu]

Excellent. Just what I need. Thanks!