3-7-4.m

周克敏 鲁棒控制基础（essential of robust control） 书后部分习题

G11 = nd2sys(1,[1,1]);
G12 = nd2sys([1,3],[1,-1,-2]);
G21 = nd2sys(10,[1,-2]);
G22 = nd2sys(5,[1,3]);
G = sbs(abv(G11,G21),abv(G12,G22));
[A3,B3,C3,D3]=unpck(G)
z0 = tzero(A3,B3,C3,D3)
Q1 = null([A3- z0([1])*eye(5),B3;C3,D3])
x = Q1([1:5])
u = Q1([6:7]) 
Q2 = null([A3- z0([2])*eye(5),B3;C3,D3])
x = Q2([1:5])
u = Q2([6:7]) 
Q3 = null([A3- z0([3])*eye(5),B3;C3,D3])
x = Q3([1:5])
u = Q3([6:7])