代码片

t=0:0.001:1;

y1=cos(2*pi*22.*t);
plot(t,y1);
hold on;
y2=cos(2*pi*20.*t);
plot(t,y2);

y3=cos(2*pi*22.*t)+cos(2*pi*20.*t);
figure;
plot(t,y3);

t=0:0.001:1;

A1=1;A2=2;W=2*pi;Y1=0;Y2=pi/3;

x=A1*cos(W.*t+Y1);
y=A2*cos(W.*t+Y2);

plot(x,y);