how can i take average of matrices in a cell?

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Joseph 2018-3-15

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评论： Joseph 2018-3-15

Hi, i have a cell array X{16*12} in which each element of cell X is a 3d array. now I want to take the average of all the matrices in the row which will result in another cell array Y{1,12} (each element of Y cell array consist of 3d array). can anyone please help me with this.

thank you

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Bob Thompson 2018-3-15

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Ok, that's definitely a bit different. Are you looking to do element averaging, or the entire matrices? Based on your indexing I'm going to guess you want elements.

That shouldn't really be too difficult to do with a couple for loops, just something like the following.

for dir1 = 1:size(cellmat,1); % Loop through rows of matrices
   for dir2 = 1:size(cellmat,2); % Loop through columns of matrices
      for dir3 = 1:size(cellmat,3); % Loop through sheets of matrices
        summation = 0; % Reset summation value to 0 for next element
        for numbermats = 1:size(greatercellmatrix,1) % Loop through all matrices in first column
             summation = summation + greatercellsmatrix{numbermats,1}(dir1,dir2,dir3); % Add next matrix element
        end % Numbermats for
        resultsmat(dir1,dir2,dir3) = summation/numbermats; % Record average of sum
      end % Sheets
   end % Columns
end % Rows

Others are welcome to chime in if there is a better way of doing this than for loops, I'll admit I have a bit of a tendency to get stuck on them simply because I know them relatively well, so other functions that do things like this tend to escape me.

Joseph 2018-3-15

编辑：Joseph 2018-3-15

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Thank you so much Bob, even though your answer wasn't that I wanted, but it gave me the idea how to do it. i was looking for the averaging of the entire matrices in the for each column of the cell X(16,12). which will result in another cell like resultcell(1,12) in which each element of resultcell is a 3D array. something like following.

   for numbercol = 1:size(X,2)
        summation = 0; % Reset summation value to 0 for next element
        for numbermats = 1:size(X,1) % Loop through all matrices in first 
        column
             summation = summation + X{numbermats,numbercol}; % Add next 
           matrix element
        end % Numbermats for
        resultcell{1,numbercol} = summation/numbermats; % save avarage of each column of the cell X in the cell resultcell

end;

Bob Thompson 2018-3-15

Cool, glad I could help. I deliberately avoided putting the answer into a cell matrix since I figured it would just be numbers and a cell matrix of numbers is just extra complicated, but you do what you need to.

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Answer 1

Andrei Bobrov 2018-3-15

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A - your cell array

one variant

[m,n,k] = size(A{1});
[h,l] = size(A);
A1 = reshape(cat(3,A{:}),m,n,k,h,l);
out = squeeze(num2cell(mean(A1,4),1:3))';

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Joseph 2018-3-15

Thanks for your Answer Andrei, this works too.

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