how to calculate mean of cell arrays within cell array

Question

Farshid Daryabor 2020-3-3

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/508731-how-to-calculate-mean-of-cell-arrays-within-cell-array

编辑： Mario Malic 2020-3-3

Dear,

I have "T_mon" which is 1X12 cell array (January to December). Each column includes another cell array (1x13), (1x12),...(1x11). For every column in 1X12 cell array, I want to get mean of T_mon{1, 1}, T_mon{1, 2} ... up to T_mon{1, 12}, to be a double within a cell 1x12. How can I do this?

This cell within the cell is coming from this piece of for loop I wrote. It might not be very clever way of doing this.

for i = 1 : 12
    A = T_mon{i};
    T_mean{i} = cellfun(@(x) nanmean(x,2), A,'UniformOutput',false);
end

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Rik 2020-3-3

So what data do you want to get the mean from? Can you show a small example? Do you want to calculate the mean of all values in T_mon{1}?

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Answer 1

Mario Malic 2020-3-3

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https://ww2.mathworks.cn/matlabcentral/answers/508731-how-to-calculate-mean-of-cell-arrays-within-cell-array#answer_418276

在 MATLAB Online 中打开

You will need to have two loops, looping over i and j.

for i = 1:length(T_mon)
    for j = 1:length(T_mon{1,i}) 
        M(i,j) = mean(T_mon{1,i}{1,j});
    end
end

I noticed that there are cells that have different sizes, so I included that with length.

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Farshid Daryabor 2020-3-3

It is what I expacted

for jj = 1 : length(T_mon)

A = T_mon{jj};

N = cellfun(@numel, A);

M = max(N);

A_new = cell2mat(cellfun(@(x) [x; nan(M - numel(x),1)],A,'uni',0));

B = nanmean(A_new,2);

C{jj}=B;

end

Mario Malic 2020-3-3

编辑：Mario Malic 2020-3-3

在 MATLAB Online 中打开

for i = 1:length(T_mon)
    for j = 1:length(T_mon{1,i}) 
        M(i,j) = sum(T_mon{1,i}{1,j});   
    end
end
A = nanmean(M,2); % mean value of rows
A = A'