% ex3_5
% 計算一階慣性環節的階躍響應
figure('pos',[120,130,300,200],'color','w')
axes('pos',[0.1 0.12 0.8 0.72]);
z=[];
for T=5:5:30;
p=[-1/T];
k=1/T;
G=zpk(z,p,k);
step(G,100);
hold on;
end;
grid; 
axis([0 100 0 1.2]);
title('T:5→30');
set(gca,'ytick',0:.2:1.2);