Plot 3D implicit function

Hi How can I plot implicit function(ellipsoid) in matlab? A*x^2+B*y^2+C*z^2+2D*xy+2E*xz+2F*yz=1 2)How can I plot two ellipsoid in one figure?

Thanks so lot

Answer 1

[Mischa Kim]

Moj, there are different routes you can take. One would be symbolic

 syms A B C D E F x y z
 sol  = solve(A*x^2+B*y^2+C*z^2+2*D*x*y+2*E*x*z+2*F*y*z-1==0, z);
 sol1 = subs(sol(1),{A,B,C,D,E,F},{1,2,3,4,5,6});
 sol2 = subs(sol(2),{A,B,C,D,E,F},{1,2,3,4,5,6});
 ezsurf(sol1)
 hold on
 ezsurf(sol2)

The hold command allows you to add several plots in the same figure.