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A=[-2 4;2 -1];
B=[0;1];
[r c]=size(A)
I=eye(r,c)
P=cont_mat(A,B);
disp(P,"Controllability Matrix=")
d=det(P)
if d==0
printf("matrix is singular, so system is uncontrollable");
else
printf("system is controllable");
end;
p=s*I-A // s*I-A
q=s^2+3*s-6;
r=roots(q)
//roots lie in rhp
printf("system is unstable")
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