% Name: aliasing.m
%
clear,close all,
t=-2:0.01:2;
n=-2:2;
x1=cos(0.6*pi*t);
x2=cos(1.4*pi*t);
x3=cos(2.6*pi*t);
x4=cos(2.6*pi*n*1);
subplot(211)
plot(t,x1,'k'),hold on,
plot(t,x2,'r:'),hold on,
plot(t,x3,'b:'),hold on,
plot(n,x4,'.')
axis([-2,2,-1.2,1.2])
title('The signals x1(t), x2(t) and x3(t)')
xlabel('Time t')