%Matlab Program 1-16
%Create model of system
A=[1 1;4 -2];
B=[1 -1; 1 -1];
C=[1 0; 0 1];
D=0;
sys=ss(A,B,C,D);
disp('Check the controllability of the system')
Co=ctrb(sys);
unco=length(A)-rank(Co)
if unco~=0
    disp('The system is uncontrollable.');
else
    disp('The system is controllable.')
end
disp('Check the observability of the system');
Ob=obsv(sys);       
unob=length(A)-rank(Ob)
if unob~=0
    disp('The system is unobservable.')
else
    disp('The system is observable')
end