[adsense:responsibe:9545213979]
clf; s=%s/(%pi*2);
g=-(s^2+4*s+6)/(s^2+5*s+4); gs=syslin('c',g); nyquist(gs); g2=(s^2+4*s+6)/(s^2+5*s+4); gs2=syslin('c',g2); nyquist(gs2); xstring(0.57,0.1,'Realimentacion Negativa'); xstring(-1.7,0.45,'Realimentacion Positiva'); mtlb_axis([-2 2 -0.5 0.5]);
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