extract and remove matrix from matrix

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Jitesh Bhanushali 2014-4-24

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https://ww2.mathworks.cn/matlabcentral/answers/126941-extract-and-remove-matrix-from-matrix

回答： Jitesh Bhanushali 2014-4-24

sir i have 256*256 matrix i want to extract all 6*6 matrix from 8*8 subblocks of 256*256 matrix.. again i want to add all zeros to 6*6 matrix and make it 8*8 what is code for that

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Walter Roberson 2014-4-24

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Is it correct that for every 8 x 8 sub-block of your image, you want to extract all 9 possible 6 x 6 sub-blocks, and pad them out to 8 x 8? When they are expanded to 8 x 8, do you want the 6 x 6 always centered, one row of 0 above, one below, one left, one right? Or do you want the parts of the 8 x 8 that are not being extracted to become 0's? e.g., one might end up like

0 0 0 0 0 0 0
0 0 0 0 0 0 0
0 1 1 1 1 1 1
0 1 1 1 1 1 1 
0 1 1 1 1 1 1
0 1 1 1 1 1 1 
0 1 1 1 1 1 1
0 1 1 1 1 1 1

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Answer 1

Jitesh Bhanushali 2014-4-24

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https://ww2.mathworks.cn/matlabcentral/answers/126941-extract-and-remove-matrix-from-matrix#answer_134377

sir i want left upper 6*6 matrix.. and i want two different codes one for extracting the upper left 6*6 matrix and another code for padding zeros and again made the matrix 8*8