question about command 'mat2cell'

Question

qing li 2022-7-30

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https://ww2.mathworks.cn/matlabcentral/answers/1771160-question-about-command-mat2cell

评论： qing li 2022-7-30

dear all, I have an problem in terms of mat2cell command...

What i already know is how to deal with specific numbers, say for instance, the code for dividing image I (size 128*128 ) into non-overlapping blocks (size 8*8) is as the following:

c = mat2cell( I, [8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8], ...

[8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8]);

But I really struggled with how to write the code when there is no specific numbers, for example, divide an image I (size 128*128) into non-overlapping blocks (size n*n) , and the total amount of blocks is 128*128/n*n...

Could anyone help..? thx a lot !

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Answer 1

Bruno Luong 2022-7-30

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https://ww2.mathworks.cn/matlabcentral/answers/1771160-question-about-command-mat2cell#answer_1018200

编辑：Bruno Luong 2022-7-30

在 MATLAB Online 中打开

I = rand(128,256);
n = 16;
mat2cell(I, n*ones(1,size(I,1)/n), n*ones(1,size(I,2)/n))
ans = 8×16 cell array
    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}
    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}
    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}
    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}
    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}
    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}
    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}
    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}    {16×16 double}

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qing li 2022-7-30

thank you so much sir, that is really helpful !

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Answer 2

Steven Lord 2022-7-30

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https://ww2.mathworks.cn/matlabcentral/answers/1771160-question-about-command-mat2cell#answer_1018210

在 MATLAB Online 中打开

Use repmat to build your vector of tile heights or widths.

A = ones(8);
n = 2;
v = repmat(n, 1, 4) % You could compute the 4 for this line
v = 1×4
     2     2     2     2
C = mat2cell(A, v, v)
C = 4×4 cell array
    {2×2 double}    {2×2 double}    {2×2 double}    {2×2 double}
    {2×2 double}    {2×2 double}    {2×2 double}    {2×2 double}
    {2×2 double}    {2×2 double}    {2×2 double}    {2×2 double}
    {2×2 double}    {2×2 double}    {2×2 double}    {2×2 double}