为什么这个程序在matlab7.1中运行不了
t=0:0.1:12:num=;Zeta1=0:den1=;
Zeta2=0.3:den2=;
Zeta3=0.5:den3=;
Zeta4=0.7:den4=;
Zeta5=1:den5=;
=step(num,den1,t);
=step(num,den2,t);
=step(num,den3,t);
=step(num,den4,t);
=step(num,den5,t);
plot(t,y1,t,y2,t,y3,t,y4,t,y5);
grid on;
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