How to type an auto-correlation function in MATLAB

Question

Jonathan Hollingsworth 2021-4-15

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https://ww2.mathworks.cn/matlabcentral/answers/802666-how-to-type-an-auto-correlation-function-in-matlab

编辑： Chunru 2021-4-15

I am trying to type the following equation into MATLAB as a basis to calculate autocorrelation values. How would I go about writing this equation as a function?

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Constantino Carlos Reyes-Aldasoro 2021-4-15

Try Matlab documentation (e.g.https://uk.mathworks.com/help/matlab/ref/xcorr.html). Come back if you have a specific question or something that did not work.

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Answer 1

Chunru 2021-4-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/802666-how-to-type-an-auto-correlation-function-in-matlab#answer_675806

编辑：Chunru 2021-4-15

在 MATLAB Online 中打开

Try the following

N=1000;
x = randn(N+1, 1);
M = 20;
R = zeros(M+1, 1);
for n=0:M
    for k=0:N-n
        R(n+1) = R(n+1) + x(k+1) * x(k+n+1);
    end
    R(n+1) = R(n+1) / (N-n+1);
end