matlab-learning/c5_5_3.m

x=(0:pi/100:2*pi);
y1=2*exp(-0.5*x);
y2=2*exp(-0.5*x).*sin(2*pi*x);
x1=(0:12)/2;
y3=2*exp(-0.5*x1).*sin(2*pi*x1);
plot(x,y1,'k:',x,y2,'b--',x1,y3,'rp');