zfig78.m

realize analysis and design for computer-controlled system

t=0:0.01:10;
y1=sin(2*pi*t*0.1);
%y2=sin(2*pi*t*1.1);%0.9, 1.9, 2.9 needs minus pi
y2=sin(2*pi*t*0.9-pi);
subplot(3,1,1)
plot(t,y1,'k--',t,y2,'r')
hold on

ts=0:1:10;
y=sin(2*pi*0.1*ts);
plot(ts,y,'b*')
axis([0 10 -1.2 1.2])