MATLAB: How to shuffle a matrix

shuffle matrix

I have matrix nxn, A=[1 2 3 4;5 6 7 8; 9 10 11 12; 13 14 15 16]; I want to shuffle this matrix, which will give AB=[1 2 5 6; 3 4 7 8; 9 10 13 14; 11 12 15 16]. Any help will be highly appreciated, Rosi.

Best Answer

Here are two methods to rearrange it according to your question. Adjust to suit the size of your matrix.
>> A=[1 2 3 4;5 6 7 8; 9 10 11 12; 13 14 15 16]
A =
    1    2    3    4
    5    6    7    8
    9   10   11   12
   13   14   15   16
>> cell2mat(reshape(cellfun(@(m)reshape(m.',2,2).',num2cell(A,2),'uni',0),2,2).')
ans =
    1    2    5    6
    3    4    7    8
    9   10   13   14
   11   12   15   16
>> reshape(permute(reshape(permute(reshape(A.',2,2,[]),[1,3,2]),4,2,[]),[1,3,2]),4,[]).'
ans =
    1    2    5    6
    3    4    7    8
    9   10   13   14
   11   12   15   16
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