extract matrix from matrix

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Jitesh Bhanushali
Jitesh Bhanushali 2014-3-28
编辑： Azzi Abdelmalek 2014-3-29
i have matrix of 256*256 n i want to extract first 4*4 matrix of every 8*8 blocks of 256*256 matrix

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Azzi Abdelmalek
Azzi Abdelmalek 2014-3-28
编辑：Azzi Abdelmalek 2014-3-29
Edit
A=rand(256) % Example
idx=1:8:256
[jj,ii]=meshgrid(idx,idx)
B=cell2mat(arrayfun(@(ii,jj) A(ii:ii+3,jj:jj+3),ii,jj,'un',0))
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Jitesh Bhanushali
Jitesh Bhanushali 2014-3-29
i want to join that 4*4 matrix into a sigle matrix

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