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z=%z; g=2*(z-0.2)/(z^4+0.3*z^2+0.5) gz=syslin('d',g) //Ecuacion caracteristica ec=numer(gz)+denom(gz) //P(1)>0 p1=horner(ec,1) //P(-1)>0 p1=horner(ec,-1) //Comprobacion mediante transformacion bilineal y Routh s=%s z1=(s+1)/(s-1) g1=2*(z1-0.2)/(z1^4+0.3*z1^2+0.5) gs1=syslin('c',g1) axec2=numer(gs1)+denom(gs1); ec2=numer(axec2) routh_t(ec2) -->routh_t(ec2) ans = 1.8888889 3.3333333 - 0.3333333 - 0.2222222 4.2222222 0. 39.222222 - 0.3333333 0. 4.2203336 0. 0. - 0.3333333 0. 0.
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