how to find mean from cell

Question

Thar 2015-1-20

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/170721-how-to-find-mean-from-cell

编辑： Star Strider 2015-1-20

Hi all!

I have the matrix:

 M=[Finally(:,1:8)];
 S=[Finally(:,9:2012)];

and

 Mc= mat2cell(M, rows, 8);
 Sc= mat2cell(S, rows, 2004);

I want to find the means of Mc and Sc.

I have the script

 for k1 = 1:size(Mc,1)
    W(k1)=mean(Mc{k1}(1:end,1));
 end

but it doesn't work.

Is anything wrong?

Thank you!

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Guillaume 2015-1-20

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You'll have to clarify, the 'it doesn't work' by posting the entire error message that you get (including the line that errors out).

As it is, your code should work. Here is a slight rewrite:

M = rand(100, 8); %demo data
rows = 20 * ones(1, size(M, 1)/20); %demo data
Mc = mat2cell(M, rows, size(M, 2));
W = cellfun(@(m) mean(m(:, 1)), Mc);

Star Strider 2015-1-20

编辑：Star Strider 2015-1-20

This looks familiar.

Thodoris, how do you calculate your ‘rows’ variable? That is likely what we will need to Answer your Question.

Context: how to find mean values?

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Answer 1

Titus Edelhofer 2015-1-20

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/170721-how-to-find-mean-from-cell#answer_165352

Hi,

first of all, why do you convert the matrix to a cell? Why not call mean for M? It should give you the mean for all columns directly. Second, using Mc{k1}(1:end,1) can be simplified by Mc{k1}(:,1). Third, "It doesn't work" sounds like you get an error message. Tell us the error message and it will be easier for us to diagnose.

Titus