A=[0 1;-1 -2];
b=[1;-1];
C=[1 0];
d=0;
n=2;
S=ctrb(A,b);
if det(S)~=0
    rcam=rank(S);
    if rcam==n
        disp('System is controlled')
    elseif rcam<n
        disp('System is no controlled')
    end
elseif det(S)==0
    disp('System is no controlled')
end