calculate mean for elements of each column in a cell array sub-entry

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mark 2022-7-12

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https://ww2.mathworks.cn/matlabcentral/answers/1757900-calculate-mean-for-elements-of-each-column-in-a-cell-array-sub-entry

评论： mark 2022-7-12

Hi,

I have a cell array, cell_array, and I am trying to calculate the mean of all the elments in each column of it's subcomponent, cell_array{3,1}:

cell_array_mean_vals=cell(1,6) %cell_array is 4x6 and cell_array_mean_vals is initialised to be 1x6
for i=1:size(cell_array{3,1},2)
    cell_array_mean_vals{1, i}=mean2(cell_array{3,1}(:,i));
end 

Error: mean2 requries the image processing toolbox and i cant use 'mean' or 'sum' because cell_array{3,1} contains doubles

Thank you

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Answer 1

Jan 2022-7-12

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https://ww2.mathworks.cn/matlabcentral/answers/1757900-calculate-mean-for-elements-of-each-column-in-a-cell-array-sub-entry#answer_1005080

在 MATLAB Online 中打开

Of courser you can use mean and sum for double arrays. Why do you think, that this is not possible?

cell_array{3,1} = magic(4);  % Some test data
for i=1:size(cell_array{3,1},2)
    cell_array_mean_vals{1, i} = mean(cell_array{3,1}(:,i));
end 
cell_array_mean_vals
cell_array_mean_vals = 1×4 cell array
    {[8.5000]}    {[8.5000]}    {[8.5000]}    {[8.5000]}
% And without a loop:
result2 = num2cell(mean(cell_array{3,1}, 1))
withoutLoop = 1×4 cell array
    {[8.5000]}    {[8.5000]}    {[8.5000]}    {[8.5000]}