# defining the mean of a values inside a matrix

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Eddy Ramirez 2021년 4월 18일
댓글: Khalid Mahmood 2021년 4월 19일
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 2021년 4월 18일
movmean() ?

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### 채택된 답변

Walter Roberson 2021년 4월 18일
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 2021년 4월 18일
this works as magic!
thank you

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### 추가 답변(1개)

Khalid Mahmood 2021년 4월 18일
편집: Khalid Mahmood 2021년 4월 18일
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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Khalid Mahmood 2021년 4월 19일
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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