LS method in idetification ,control engeeniring

Hi,how are you?I have problem with that code,is about LS method with ARX model in identification,I should use xcorr command for EPS variable to compare it that how much is near to white noise ?

[Sulaymon Eshkabilov]

You should be a bit more clear with your question. Follow these guidelines:

https://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

[saeed]

I think every thing is clear, my note is about control engeeniring

[saeed]

clc, clear, close all, N=100; e=100*randn(1,N); x=1:N; a2=0.5; a1=1; a0=2; y=a2*x.^2+a1*x+a0+e; plot(x,y,'Linewidth',2); phi=ones(N,1); Y=y'; theta_hat=phi./Y; Y_hat=phi.*theta_hat; Eps=Y-Y_hat; V0=Eps'*Eps/2; hold on, plot(x,Y_hat,'LineWidth',2); clear phi theta_hat

[saeed]

How can I compare Eps with e by xcorr command to know that error is atleast near to white noise