The auto-correlation of a periodic signal preserves the periodicity | MATLAB Visualization

Code:

clc

clear all

close all

t=0:1:100;

x=sin(2*pi*0.05*t);

subplot(2,1,1);

plot(t,x);

grid on;

m=xcorr(x,x);

t1=t;

t2=-fliplr(t);

n1=min(t1)+min(t2);

n2=max(t1)+max(t2);

n=n1:1:n2;

subplot(2,1,2);

plot(n,m);

grid on;