Mean value in a cell array

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Pinga
Pinga 2014-10-11
评论： Pinga 2014-10-11
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.

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Guillaume
Guillaume 2014-10-11
编辑：Guillaume 2014-10-11
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

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SK
SK 2014-10-11
编辑：SK 2014-10-11
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.
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SK
SK 2014-10-11
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 2014-10-11
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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