What did i do wrong in this code when i calculate the average of all the run

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Phong Pham 2012-11-26

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I run 9 sets of data and try to take the average of 9 sets. I calculate the mean but it shows the mean equals to the last set of data (set 9). It does not calculate the mean at all. Li is a matrix 101 x 9

for nrun = 1:9

% Calculate each Li

 Li(:, nrun) = ........
 LMean= mean(Li(:,nrun),2)

end

Did I code it wrong? Please helps

Thanks

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Walter Roberson 2012-11-26

Please restore the question so that others may learn from it.

Randy Souza 2012-11-29

I have restored the original text of this question.

Phong Pham, this question has a clear subject and an accepted answer, so it may be valuable to someone else in the future. If you have a good reason why it should be removed from MATLAB Answers, please flag the question, explain why it should be deleted, and an administrator or high-reputation contributor will consider deleting the question. Please do not simply edit your question away.

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Answer 1

Walter Roberson 2012-11-26

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You are overwriting LMean on each iteration through the loop.

You could delay the mean() call until after the loop, and then use

LMean - mean(Li,2);

This would be for calculating the 101 x 1 mean (mean of each point across the datasets.) If you were looking for the 1 x 9 mean (mean of each dataset) it would be

LMean = mean(Li);