Mean value in a cell array

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Pinga
Pinga on 11 Oct 2014
Commented: Pinga on 11 Oct 2014
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.

Accepted Answer

Guillaume
Guillaume on 11 Oct 2014
Edited: Guillaume on 11 Oct 2014
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
  1 Comment
Pinga
Pinga on 11 Oct 2014
Thank you a lot - this works great!

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More Answers (1)

SK
SK on 11 Oct 2014
Edited: SK on 11 Oct 2014
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.
  3 Comments
SK
SK on 11 Oct 2014
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
Pinga on 11 Oct 2014
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.

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