% ex4_1r
% 繪制奈魁斯特圖
Fig=figure('pos',[30,50,260,200],'color','w');
axes('pos',[0.15 0.2 0.7 0.7]);
syms s w G1 G2 G1s G2s
G1=1/(10*s+1);
G2=1/((s+1-.2*j)*(s+1+.2*j));
G1s=subs(G1,s,j*w);
G2s=subs(G2,s,j*w);
ezplot(real(G1s),imag(G1s),[0 5],Fig);hold on;
ezplot(real(G2s),imag(G2s),[0 5],Fig);