Finding the indices of duplicate maximum number of non zero element in matrix

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NA 2019-1-7

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https://ww2.mathworks.cn/matlabcentral/answers/438593-finding-the-indices-of-duplicate-maximum-number-of-non-zero-element-in-matrix

评论： madhan ravi 2019-1-7

I have this matrix

 A=[-1 -0.3313 0 1 0.55 -0.2186 -1.0041 -0.0297 0 0.0041 0 0.0297;
    0 0 0 0 1.09 -0.09 0 0 0 0 0 0;
    0 0 0 0 0 0 0 0 0 0 0.5 0.5;
    0 0 0 0 0 0 0 0 0 0 -0.375 1.375;
    -1 0.2108 0 1 -0.35 0.1392 -0.9675 0.238 0 -0.0325 0 -0.238];

I want to find a rows that gives me maximum number of non zero element.

answer should be row=[1,5]

I use this one [~,Q1]=max(sum(A~=0,2) ) but it does not give [1,5]

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Answer 1

madhan ravi 2019-1-7

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https://ww2.mathworks.cn/matlabcentral/answers/438593-finding-the-indices-of-duplicate-maximum-number-of-non-zero-element-in-matrix#answer_355322

编辑：madhan ravi 2019-1-7

在 MATLAB Online 中打开

EDITED

Note: max only returns the index of the max value at the first instant so in order to find all the indices of max value you would have to use find().

 A=[-1 -0.3313 0 1 0.55 -0.2186 -1.0041 -0.0297 0 0.0041 0 0.0297;
    0 0 0 0 1.09 -0.09 0 0 0 0 0 0;
    0 0 0 0 0 0 0 0 0 0 0.5 0.5;
    0 0 0 0 0 0 0 0 0 0 -0.375 1.375;
    -1 0.2108 0 1 -0.35 0.1392 -0.9675 0.238 0 -0.0325 0 -0.238];
a=(sum(A~=0,2));
Row=find(a==max(a)).'

Gives: