fig5_41.m

现代控制系统（matlab程序）

% Chapter 5: Figure 5.41, p. 274
%
%    Compare step response for second-order approximation
%
num1=[6]; den1=[1 6 11 6];
num2=[1.6]; den2=[1 2.584 1.6];
t=[0:0.1:8];
[y1,x,t]=step(num1,den1,t);
[y2,x,t]=step(num2,den2,t);
plot(t,y1,t,y2,'--'), grid
xlabel('time [sec]'), ylabel('step response')