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Calculate mean from a cell array.

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Rajvi Amle
Rajvi Amle on 16 Jul 2021
Edited: Rik on 18 Jul 2021
I am trying to calculate the mean from 1x10 cell array where the array contains matrices of 138x1 dimensions. But the dimensions of all 10 arrays are not the same. So is it possible to calculate mean out of all together the cell arrays having different dimensions? Here I am attaching the file Sum_col.mat from which I want to calculate the mean.
Any help would be really appreciated. Thank you in advance.

Accepted Answer

Rik
Rik on 16 Jul 2021
Two options of what you could mean:
%load your data first
websave('data.mat','https://www.mathworks.com/matlabcentral/answers/uploaded_files/686468/Sum_col.mat');
Sum_col=load('data.mat');Sum_col=Sum_col.Sum_col
Sum_col = 1×10 cell array
{135×1 double} {138×1 double} {136×1 double} {136×1 double} {133×1 double} {136×1 double} {136×1 double} {135×1 double} {137×1 double} {136×1 double}
%mean of each cell (returning a 1x10 array)
cellfun(@mean,Sum_col)
ans = 1×10
0.0785 0.0792 0.0773 0.0814 0.0712 0.0781 0.0716 0.0701 0.0790 0.0763
%mean of every element (returning a 138x1 array)
tmp=Sum_col;max_sz=max(cellfun('prodofsize',tmp));
for n=find(cellfun('prodofsize',tmp)<max_sz)
tmp{n}((end+1):max_sz)=NaN; % fill extra entries with NaN
end
mean(cell2mat(tmp),2,'omitnan')
ans = 138×1
0 0.0004 0.0007 0.0011 0.0029 0.0046 0.0064 0.0080 0.0109 0.0137
  2 Comments
Rik
Rik on 18 Jul 2021
I would suggest using the std function, instead of calculating it yourself. The std function also has an omitnan flag.
If you want to calculate the number of elements yourself, you can use the sum of the result of the isnan function.

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