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

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mark
mark 2022-7-12
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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回答（1 个）

Jan
Jan 2022-7-12
Ran in:
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]}
  1 个评论
mark
mark 2022-7-12
thank you for your response!
I get this error when I try both approaches:
Error using sum
Invalid data type. First argument must be numeric or logical.
Error in mean
y=sum(x,dim,flag)./mysize(x,dim);

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