How to replace diagonal of square matrices within a cell array?

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Adnan Habib 2021-9-11

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评论： Star Strider 2021-9-13

I have a 940X1 cell array where each element is a 298X298 square matrix. I want to replace the main diagonals of each square matrix with zero. Is there a way to do it?

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Star Strider 2021-9-11

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The easiest way is to subtract the diagonal of each matrix from the matrix —

C = {rand(4); rand(4); rand(4)}
C = 3×1 cell array
    {4×4 double}
    {4×4 double}
    {4×4 double}
Cr = cellfun(@(x) x-diag(x), C, 'Unif',0)
Cr = 3×1 cell array
    {4×4 double}
    {4×4 double}
    {4×4 double}
Cr{1}
ans = 4×4
         0    0.5651    0.1597    0.4081
    0.0049         0   -0.5032    0.3582
    0.4049    0.8147         0    0.2985
   -0.4793   -0.4366   -0.5270         0
Cr{3}
ans = 4×4
         0    0.2540   -0.2275   -0.0101
    0.1521         0   -0.7862   -0.3234
    0.5575   -0.0462         0   -0.1965
   -0.4953   -0.3632   -0.5305         0