defining the mean of a values inside a matrix

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Eddy Ramirez 2021-4-18

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https://ww2.mathworks.cn/matlabcentral/answers/806006-defining-the-mean-of-a-values-inside-a-matrix

评论： Khalid Mahmood 2021-4-19

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

Greetings,

I was trying to find a way to find the mean of the values inside the matrix. For example, [1,2,3,4,5,6] I want to find the average between 1 & 2/ 2&3/3&4/4&5 and so on

I tried to do a for-loop but It doesnt seemt to work when I compare the values to hand calculations

z18=(-length(theta)/2+(0:length(theta)))'*h; % Travel of total 18 layers %%%% 19 values due to neutral axis
z18t=((-length(theta)/2+(0:length(theta)))'*h)/2; %% I took this approach as well but it does not work 
for t=1:length(z18)
    tt=max(1,(t-1));
    ttt=min(length(z18), t+1);
    tttt(t)=mean(z18(tt:ttt));
end

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Walter Roberson 2021-4-18

movmean() ?

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Walter Roberson 2021-4-18

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https://ww2.mathworks.cn/matlabcentral/answers/806006-defining-the-mean-of-a-values-inside-a-matrix#answer_678371

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A = randi(9, [1 6])
A = 1×6
     8     2     2     3     6     3
[A(1), A(1:end-1) + diff(A)/2, A(end)]
ans = 1×7
    8.0000    5.0000    2.0000    2.5000    4.5000    4.5000    3.0000

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Eddy Ramirez 2021-4-18

this works as magic!

thank you

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Khalid Mahmood 2021-4-18

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https://ww2.mathworks.cn/matlabcentral/answers/806006-defining-the-mean-of-a-values-inside-a-matrix#answer_678376

编辑：Khalid Mahmood 2021-4-18

在 MATLAB Online 中打开

Further methods

1: movmean(matrix,windowsize) it calculates running mean but considers only windowsize elements

examples:

mm2=movmean(z18,2)
mm3=movmean(z18,3)

Using for loop to calculate running mean as [z18(1), (z18(1)+z18(2)/2, ( (z18(1)+z18(2) )/2+ z18(3) )/3,...]

mm=z18(1); 
for p=2:length(z18)
    mm(p)=(mm(p-1)+z18(p))/p;
end

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Sufia Tanveer 2021-4-18

I learnt more from comments than actual question!

Khalid Mahmood 2021-4-19

And remember, In moving mean, last value of source vector is not copied in result. It is actually calculated. So moving mean methods, movmean, mm code (to rduce in a mean way), and vectorised cumsum./[1:src] methods are actual moving mean methods. Those are just different types of moving means

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