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

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

Answer 1

[Jan]

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]}

[mark]

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);