mean value of each row

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ava 2012-2-5

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https://ww2.mathworks.cn/matlabcentral/answers/28112-mean-value-of-each-row

评论： Walter Roberson 2021-9-2

采纳的回答： Walter Roberson

I have A 500 by 16 matrix and I want to find a mean value of each row and return the result as a 500 by 1.

Does anyone have an idea?

Thank you

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Walter Fanka 2018-7-15

编辑：Walter Roberson 2018-7-17

在 MATLAB Online 中打开

y = yourmatrix;
meanrow_y = mean(y')'

Walter Roberson 2018-7-17

That should work for 2D arrays like were asked about. However for 3 or more dimensions it would not work and you would need to use a couple of permute() instead. It is a lot easier to just pass in the dimension number like I showed in my Answer.

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Answer 1

Walter Roberson 2012-2-5

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https://ww2.mathworks.cn/matlabcentral/answers/28112-mean-value-of-each-row#answer_36403

在 MATLAB Online 中打开

mean(YourMatrix,2)

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Jan 2017-3-15

在 MATLAB Online 中打开

The documentation of mean explains this exhaustively already:

doc mean

The first input is the data, the 2nd the dimension to operate on. Therefore mean(x,2) is the mean over the 2nd dimension, which means the rows.

Amy Gleckl 2019-12-20

I had a similar issue and this worked perfectly for me, thank you very much!

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Answer 2

sura Naji 2019-10-25

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l have amatrix contact from 1 colum and 1000 rows l want to find the mean and the standard deviation also l want to find the worst value of this because l use the particle swarm optimization

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Walter Roberson 2019-12-22

在 MATLAB Online 中打开

M = mean(amatrix);
S = std(amatrix);
[~, order] = max(abs(amatrix - M));
furthest_from_mean = amatrix(order(1));

Note that the value that is furthest from the mean will also be the value that is the greatest zscore (furthest deviation)

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Answer 3

RAMPUNIT KUMAR 2021-9-2

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RAMPUNIT KUMAR less than a minute ago ⋮ I too have a doubt, like for matrix (a b c d e f g h I j k l m n o p q r) I need to find the mean of a,b then c,d then e,f then g,h and so on upto last element. How could we do that if size is big enough.