Adding elements of a matrix

Hi, I've attached an image of a variable i have. the variable F is a 5x22 cell, each element in the cell is a 1x3 containing RGB numbers. is there a way to make F the average of all those elements?

* adding the first column and averaging it to make Red pixels
* adding the second column and averaging it to make green pixels
* adding the third column and averaging it to make blue pixels

Answer 1

[KSSV]

K = cell(2,3) ;

for i = 1:2
    for j = 1:3
        K{i,j} = rand(3,1) ;
    end
end

iwant = cellfun(@mean,K)

Or you can run a loop too.

Answer 2

[KL]

I'm not entirely sure what you want but if you want to calculate mean of all the RGB numbers and have 1x3 result,

 mean(cell2mat(F(:)))