Question

matlab画三元函数

F1: x^2+2y^2+2z^2=20F2: x^2+y^2+z=4

Answer 1

%F1

[x, y, z] = ellipsoid(0,0,0,2*sqrt(5),sqrt(10),sqrt(10),120);

surfl(x, y, z)

hold on

%F2

syms x y;

z=4-x.^2-y.^2;

ezsurf(subs(z),60)

hold on

grid on

axis([-5,5,-5,5,-5,5])