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%%%%%%%%%%%%%% clc;clear;

%%%%%%%%%%%%% k=[0.2,0.5,1,2,5]; %%%%%%%%%%%%% for k1=k

figure(1),hold on sys=tf(k1,[0.5,1,k1]) step(k1,[0.5,1,k1]); figure(2);hold on margin(sys); end

%%%%%%%%%%%%%% figure(1);

gtext('k=0.2')£¬gtext('k=0.5')£¬gtext('k=1')£¬figure(2);

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