extract matrix from matrix

2014 3 28
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更新时间：2014 3 29
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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

1 个投票

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 2014-3-28
but i have matrix of 256*256 n i want to extract first 4*4 matrix of every 8*8 blocks of 256*256 matrix
Azzi Abdelmalek
Azzi Abdelmalek 2014-3-28
This is another question, please edit your question
Azzi Abdelmalek
Azzi Abdelmalek 2014-3-28
A=rand(256) % Example
idx=1:8:256
[jj,ii]=meshgrid(idx,idx)
B=arrayfun(@(ii,jj) A(ii:ii+3,jj:jj+3),ii,jj,'un',0)
Jitesh Bhanushali
Jitesh Bhanushali 2014-3-28
not returning value of 4*4 matrix
Azzi Abdelmalek
Azzi Abdelmalek 2014-3-28
B is a cell array containing all 4x4 arrays. Type
celldisp(B)
Jitesh Bhanushali
Jitesh Bhanushali 2014-3-29
sir how to store that celldisp(B)...
Jitesh Bhanushali
Jitesh Bhanushali 2014-3-29
i want to join that 4*4 matrix into a sigle matrix

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