getting the max and its positions from a 4D array

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Sanghyun Lee
Sanghyun Lee 2019-9-11
回答： Andrei Bobrov 2019-9-12
I'm trying to find a way to get the Max value from a 4D array and get the position of each of the max values of the 4D array so that I can trace back and get those positions from another 4D array. It would be great if someone can help me. Thanks in advance!
What I want is to get all the max values of each individual rows and columns and the 3rd dimension and its positions in the 4D.
  2 个评论
Guillaume
Guillaume 2019-9-11
each of the max
along which dimension(s)? Are you expected a 3D, 2D, 1D, or scalar value in return?
Sanghyun Lee
Sanghyun Lee 2019-9-11
well I guess the max dimensions is 3D but what I want to find is the 4D dimension/positions of each of the max values from which the dimension

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回答（2 个）

Star Strider
Star Strider 2019-9-11
Try this:
A = rand(3,3,3,3); % Create Array
Amax = max(A(:)); % Maximum Value
Idx = find(A(:) == Amax); % Returns Linear Indices To All ‘Amax’ Values
[r,c,dim3,dim4] = ind2sub(size(A), Idx); % Returns Subscripts In Each Dimension For All ‘Amax’ Values
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Guillaume
Guillaume 2019-9-11
Don't knoiw what before refers to.
oh wait I just realised this.
Really? you don't know what the size of each dimension is? Then, yes you're going to struggle writing your code if you don't know what is happening with your dimensions.
Sanghyun Lee
Sanghyun Lee 2019-9-12
well no I knew it in my brain but my mind just realised

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Andrei Bobrov
Andrei Bobrov 2019-9-12
Maybe this:
[m,n,k,f] = size(totalDistance);% here k = 1
[~,ij] = max(totalDistance,[],4);
[I,J,K] = ndgrid(1:m,1:n,1:3);
F = repmat(ij,1,1,3);
finalPixels = imagesList(sub2ind([m,n,3,f],I,J,K,F)); % [m,n,3,f] size of imagesList

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