MATLAB: How to Make this Matrix Work

Question

x=5;
y=0;
z=0;
S=[(1.28*10^10)x*y-(2.56*10^10)y (2.56*10^6)-(6.4*10^9)*(y^2) -(6.4*10^9)y*z; (2.56*10^6)-(6.4*10^9)*(y^2) -(1.28*10^10)x*y+(2.56*10^10)y 0; 0 -(6.4*10^9)y*z -(1.28*10^10)x*y+(2.56*10^10)y];
[Q, Lambda]=eig(S);
disp(Lambda);

I want to plug in values of x y and z for the Matrix S, but for some reason it shows that I have error. How do I fix matrix S so it works in MATLAB?

Answer 1

%if true
  % code
%end
x=5;
y=0;
z=0;
S=[(1.28*10^10)*x*y-(2.56*10^10)*y (2.56*10^6)-(6.4*10^9)*(y^2) -(6.4*10^9)*y*z; (2.56*10^6)-(6.4*10^9)*(y^2) -(1.28*10^10)*x*y+(2.56*10^10)*y 0; 0 -(6.4*10^9)*y*z -(1.28*10^10)*x*y+(2.56*10^10)*y];
[Q, Lambda]=eig(S);
disp(Lambda);