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244 Ingeniería de control moderna<br />

MATLAB Programa 5-21<br />

a % [1 4 16 36];<br />

b % [0.6 2 5.6 9.6];<br />

t % 0:0.1:8;<br />

y % zeros(81,4);<br />

for i % 1:4;<br />

num % [a(i)];<br />

den % [1 b(i) a(i)];<br />

y(:,i) % step(num,den,t);<br />

end<br />

plot(t,y(:,1),'o',t,y(:,2),'x',t,y(:,3),'-',t,y(:,4),'-.')<br />

grid<br />

title('Respuesta a un escalón unitario para cuatro casos')<br />

xlabel('t Seg')<br />

ylabel('Salidas')<br />

gtext('1')<br />

gtext('2')<br />

gtext('3')<br />

gtext('4')<br />

Figura 5-59. Curvas de respuesta a un escalón unitario para<br />

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cuatro casos.

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