how to extract 2d window from a 2d matrix

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MSP 2017-3-31

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https://ww2.mathworks.cn/matlabcentral/answers/332980-how-to-extract-2d-window-from-a-2d-matrix

评论： Guillaume 2017-3-31

采纳的回答： Guillaume

data_format.pdf

consider you have a 9/9 matrix 2d.It is required to extract 9 matrixes like the attachment

How to do it by using loops as it will help in further calculations

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Answer 1

Guillaume 2017-3-31

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https://ww2.mathworks.cn/matlabcentral/answers/332980-how-to-extract-2d-window-from-a-2d-matrix#answer_261232

编辑：Guillaume 2017-3-31

在 MATLAB Online 中打开

No loop needed:

mat2cell(yourmatrix, [3 3 3], [3 3 3])

or you could just reshape the matrix as 3x3x9 and loop over the pages whenever you need access to these 9 matrices:

matrices = reshape(yourmatrix, 3, 3, [])
%m(:, :, x) is matrix x

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MSP 2017-3-31

编辑：MSP 2017-3-31

This does not print the right output.And moreover reshaping is cumbersome as the matrix may be not a x/x matrix rather x/y matrix and some of the matrix elements are needed to be truncated as well

Guillaume 2017-3-31

First answer should have been mat2cell not cell2mat. Fixed now.

This does not print the right output: then give, as text, not an image, so we can copy/paste into matlab, an example of input and desired output.

_ reshaping is cumbersome_. It's probably the easiest, and least cumbersome way to do what you want. Whether the matrix is square or not does not change anything. However, if some of the blocks needs to be bigger than others, then use mat2cell which is just as easy.

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