Get the max value and the indices of max value across a series of matrices

Question

Anwar S 2018-8-20

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https://ww2.mathworks.cn/matlabcentral/answers/415560-get-the-max-value-and-the-indices-of-max-value-across-a-series-of-matrices

评论： Anwar S 2018-8-20

I have a 25x50 matrix each having another 128x128 matrix in each cell. Now I want to create a 25x1 matrix that will have a 128x128 matrix in each cell containing the maximum value across those eleven 128x128 matrices in each row. I also need the index of that cell from which the maximum value came from.

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Answer 1

Andrei Bobrov 2018-8-20

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https://ww2.mathworks.cn/matlabcentral/answers/415560-get-the-max-value-and-the-indices-of-max-value-across-a-series-of-matrices#answer_333463

在 MATLAB Online 中打开

Let A - your cell array (25 x 50) with double matrix 128 x 128.

n = size(A,1);
maxvalue = cell(n,1);
maxidx = cell(n,1);
for ii = 1:n
    [maxvalue{ii},maxidx{ii}] = max(cat(3,A{ii,:}),[],3);
end

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Anwar S 2018-8-20

works like a charm! Thanks, Andrei.

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Answer 2

Julie 2018-8-20

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https://ww2.mathworks.cn/matlabcentral/answers/415560-get-the-max-value-and-the-indices-of-max-value-across-a-series-of-matrices#answer_333466

在 MATLAB Online 中打开

 BigMat=cellfun(@(x) cat(3,DATA{:,x}),num2cell(1:25),'UniformOutput',false)
 [maxVal idx] = cellfun(@(x) max([BigMat{x}],[],3),num2cell(1:25),'UniformOutput',false)

BigMat is all of the columns concatenated into 3D matrices (use DATA{x,:} for rows instead). Then the value and indices are found using max.