ex5_17.m

反馈控制系统设计与分析（matlab程序）

G=tf(40,[conv([1,1],[0.0125,1]),0]); 
mncirc; hold on,  nyquist(G); axis([-4 2 -3 3])
figure; G_c=feedback(G,1); step(G_c)

N=[6,2,1]; f1=figure; mncirc; hold on; f2=figure;
for i=1:length(N)
   figure(f1); G.num={N(i)}; nyquist(G); axis([-4,2,-3,3]); 
   figure(f2); G_c=feedback(G,1);
   step(G_c); hold on
end