Mean value in a cell array

Hi!

I have a 16x8 cell (containing 6x11 cells) with the name FinalResult. I now would like to calculate the mean value of FinalResult{1:16,4}(1,2) and have tried it with

cellfun(@mean,FinalResult{1:16,4}(1,2))

but this will give me the error message "Bad cell reference operation". Where is the mistake?

Thank you in advance for any help.

Answer 1

[Guillaume]

I'm assuming that the cell array contains matrices not more cell arrays, that is the 6x11 are actually matrices. In which case, this would work:

mean(cellfun(@(c) c(1,2), FinalResult(:, 4)));

What it does is:

1. Create a cell array that is a subset of your whole array with FinalResult(:, 4). Note that I use () instead of {}. The former returns a cell array, the latter a list of elements.
2. Iterate over that subset and extract element (1, 2) of each matrix, with cellfun.
3. get the mean of the elements returned by cellfun

[Pinga]

Thank you a lot - this works great!

Answer 2

[SK]

Put square brackets around the cellarray contents like:

M = [FinalResult{1:16,4}]
m = mean(M,2);

Putting the square brackets converts it into a matrix.

[Pinga]

Hi SK

Thank yo for your reply. This was not the solution I am looking for, since I want to calculate the mean of all (1,2) of every double (not column) in the cell FinalResult{1:16,4}. So, basically this is what I want to calculate:

((FinalResult{1,4}(1,2))+(FinalResult{2,4}(1,2))+(FinalResult{3,4}(1,2))+....+(FinalResult{1,16}(1,2)))/length(FinalResult)

Any help would be appreciated.

[SK]

OK, I didn't read the question properly.

In that case:

C = FinalResult(1:16, 4);
D = [C{:}];
E = reshape(D, [6,11,16]);
M = cell2mat(E);
Mx = mean(M,3);

Mx(i,j) should then contain the mean of the index (i,j).

[Pinga]

Thank you! Unfortunately, I got a error message for M ("Cell contents reference from a non-cell array object"). But the solution from Guillaume works - problem solved.