How can I make the mean of 3d matrices in a cell in Matlab?

John Williams answered . 2025-07-14 13:50:43

One you have the data in a 4d array it's simple enough, just use mean and supply the dimension to work over as you suggest. As @Cris notes you might run out of memory forming the 4d array (since it will copy all the data) in which case you'll want to loop over the existing arrays. But if you have enough memory this should work:

 

% make 12 random 3d arrays in cell array `c`
for i=1:12
    c{i} = rand(10, 10, 10); 
end

% Make a 4d array:
array4d = cat(4, c{:}); % Same as writing cat(4, c{1}, c{2}, c{3}, etc)

m = mean(array4d, 4);  % Take the mean along the 4th dimension
size(m)  % Show the size of the output (here should be 10,10,10)

 

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