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clc;
clear;
A=[-18/7 9 0; 1 -1 1; 0 -14.28 0];%
n = length(A);
B=[27/7 0 0]';%
C=[1 0 0];
H=[1 0 0];
k=1;
setlmis([]);
% Define Variables
%P Q is a symmetric matrix, has a block size of 2 and this block is symmetric
Q = lmivar(1,[3 1]);
P = lmivar(1,[3 1]);
Y = lmivar(2,[3 1]);
M1=lmivar(1,[3 1]);
M2=lmivar(1,[3 1]);
V =lmivar(1,[1 0]);
% tau_max=lmivar(1,[1 0]);
% Q, P, V > 0
lmiterm([-1 1 1 Q], 1, 1);
lmiterm([-2 1 1 P], 1, 1);
lmiterm([-3 1 1 V], 1, 1);
%lmiterm([5 1 1 tau_max], 1, 1);
% pos in (1, 1)
lmiterm([-4 1 1 P], -1, A, 's');
lmiterm([-4 1 1 Q], -1, 1);
lmiterm([-4 1 1 M1], -1, 1);
lmiterm([-4 1 1 -M1], -1, 1);
% pos (1, 2)
lmiterm([-4 1 2 Y], 1, H);
lmiterm([-4 1 2 -M1], 1, 1);
lmiterm([-4 1 2 M2], -1, 1);
% pos(1, 3)
lmiterm([-4 1 3 P], -1, B);
lmiterm([-4 1 3 V], -k*C',1);
% pos(1, 4)
lmiterm([4 1 4 P], -A', 1);
% pos(1, 5)
lmiterm([4 1 5 -M1], -1, 1);
% pos(2, 2)
lmiterm([-4 2 2 Q], 1, 1);
lmiterm([-4 2 2 M2], 1, 1);
lmiterm([-4 2 2 -M2], 1, 1);
% pos(2, 4)
lmiterm([4 2 4 -Y], -H', -1);
% pos(2, 5)
lmiterm([4 2 5 -M2], 1, -1);
% pos(3, 3)
lmiterm([-4 3 3 V], 2, 1);
% pos(3, 4)
lmiterm([4 3 4 P], -B', 1);
% pos(4, 4)
lmiterm([-4 4 4 P], 1, 1);
% pos(5, 5)
lmiterm([-4 5 5 P], 1, 1);
lmis = getlmis;
[t,xopt]=gevp(lmis,1);
t
tt=1/t
QQ = dec2mat(lmis,xopt,Q)
PP = dec2mat(lmis,xopt,P)
YY = dec2mat(lmis,xopt,Y)
vv=dec2mat(lmis,xopt,V)
K=inv(PP)*YY

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