u=zeros(4,1);
y=zeros(3,1);
e=zeros(4,1);
a=[0.368,0,0];
b=[0,0,0,0.632];
c=[0,0,0,1];
d=[1.582,-0.5822,0,0];
yk=0;
yt=0;
t=0;

r=1;
ek=0;
for k=1:20
    ek=r-yk;     %提前一拍獲得誤差值
    e=[ek;e(1:3)];
    uk=c*u+d*e;
    u=[uk;u(1:3)];
    yk=a*y+b*u; 
    y=[yk;y(1:2)]; 
    yt=[yt,yk];
    t=[t,k*0.5];
end
axis([0,2,0,10])
yt
plot(t,yt,'b')