Mean value in a cell array

Question

Pinga 2014-10-11

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https://ww2.mathworks.cn/matlabcentral/answers/158212-mean-value-in-a-cell-array

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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Answer 1

Guillaume 2014-10-11

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编辑：Guillaume 2014-10-11

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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:

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.
Iterate over that subset and extract element (1, 2) of each matrix, with cellfun.
get the mean of the elements returned by cellfun

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Pinga 2014-10-11

Thank you a lot - this works great!

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Answer 2

SK 2014-10-11

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https://ww2.mathworks.cn/matlabcentral/answers/158212-mean-value-in-a-cell-array#answer_154768

编辑：SK 2014-10-11

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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 2014-10-11

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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 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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