extract matrix from matrix

i have matrix of 256*256 n i want to extract first 4*4 matrix of every 8*8 blocks of 256*256 matrix

Answer 1

[Azzi Abdelmalek]

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))

[Jitesh Bhanushali]

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]

This is another question, please edit your question

[Azzi Abdelmalek]

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]

not returning value of 4*4 matrix

[Azzi Abdelmalek]

B is a cell array containing all 4x4 arrays. Type

celldisp(B)

[Jitesh Bhanushali]

sir how to store that celldisp(B)...

[Jitesh Bhanushali]

i want to join that 4*4 matrix into a sigle matrix

[Azzi Abdelmalek]

cell2mat(B)