The problem of autocorrelation function

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wenxin liu
wenxin liu 2021-9-5
评论： wenxin liu 2021-9-6
According to a differential equation in matlab, the time series x(t) is obtained. To obtain the autocorrelation result of the following figure, xs(t)=x(t-s), s is also a variable, how to write a program in matlab.

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回答（1 个）

Image Analyst
Image Analyst 2021-9-5
Isn't it just
autoCorrelation = xcorr(x, x);
but that seems so obvious so I'm wondering if this is your homework problem and you have to not use the MATLAB function and write your own version of it. If so, read the following link:
How do I get help on homework questions on MATLAB Answers? - MATLAB Answers - MATLAB Central
If it's not homework, xcorr() should work for you.
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wenxin liu
wenxin liu 2021-9-6
Sorry, please forgive my mistake.
Here are my steps:
Step 1: I solve the differential equations (1,2) through ode45(), and get E(t),N(t)
Step 2: Let x(t)=E(t); then perform equation 3.xcorr(x(t),x(t-s)).
But s is also a variable with scope, it belongs to (0,5e-9). So I don't know what to do.

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