一 clear a=1; b=1 0.4 0.08; w=linspace(-2*pi,2*pi,512); h=freqs(a,b,w); subplot(2,1,2),plot(w/pi,angle(h);subplot(2,1,1),plot(w/pi,abs(h);二 clear a=2 0; b=1 2,10001; w=linspace(-2*pi,2*pi,512); h=freqs(a,b,w); subplot(211),plot(w/pi,abs(h); subplot(212),plot(w/pi,angle(h); clear syms t; v1=(1+cos(t)*cos(100*t); V=laplace(v1); syms s; H=2*s/(s2+2*s+10001); V2=V*H; v2=ilaplace(V2); ezplot(v2,-0.1*pi,0.1*pi)
