4-4-1.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=abv(sbs(G11,G12),sbs(G21,G22));
[Gs,Gu]=sdecomp(G);
h2s=h2norm(Gs);
h2s 
h2u=h2norm(cjt(Gu))
h2u
h2=(h2s^2+h2u^2)^(1/2);
h2
 hi=hinfnorm(G,0.0001);
hi 
 hi=linfnorm(G,0.0001);
hi