Computing the mean over 3 numbers in a vector

Question

Lily 2014-3-5

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https://ww2.mathworks.cn/matlabcentral/answers/120208-computing-the-mean-over-3-numbers-in-a-vector

回答： Rick Rosson 2014-3-5

Hi

I have a vector that I want to find the average over each 3 numbers. So if I have a vector A and sampling it over 3 I would get new_A. However my solution isn't working. Could you help me?

A = [1 2 3 4 5 6 7 8 9 10 11 12 13 14 15]; %The vector
count = 1;
for i = 1:3:length(A)
    new_A(count) = mean(A(i:i+1));
    count = count+1;
end
new_A = [2 5 8 11 14]; %The desired ouput

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Answer 1

Rick Rosson 2014-3-5

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https://ww2.mathworks.cn/matlabcentral/answers/120208-computing-the-mean-over-3-numbers-in-a-vector#answer_127103

在 MATLAB Online 中打开

... = mean(A(i:i+2));

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Answer 2

Walter Roberson 2014-3-5

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https://ww2.mathworks.cn/matlabcentral/answers/120208-computing-the-mean-over-3-numbers-in-a-vector#answer_127102

Sliding window or each distinct group of 3? If it is each distinct group of 3, then reshaping to 3 x something and then mean() along the dimension you made 3.