f=[0.7754 0 1;0.3346 0.7648 -0.5661;0.2448 0.3725 2.2254];
g=[0.3175;0.2832;0.2759];
c=[0 1.5 2.7210];
d=0;
n=3;
ob=obsv(f,c);
roam=rank(ob);
if roam==n
    disp('System is observable')
elseif roam~=n
    disp('System is no observable')
end