how to extract 2d window from a 2d matrix

7 views (last 30 days)
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

Accepted Answer

Guillaume
Guillaume on 31 Mar 2017
Edited: Guillaume on 31 Mar 2017
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
  2 Comments
Guillaume
Guillaume on 31 Mar 2017
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.

Sign in to comment.

More Answers (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by