matlab画图怎么画出一个图形为圆环面和球面的组合

R=5;r=2;
syms u v;
ezmesh((R+r*cos(u))*cos(v),(R+r*cos(u))*sin(v),r*sin(u),[-pi,pi]);
hold on;
ezmesh(r*cos(u)*cos(v),r*cos(u)*sin(v),r*sin(u),[-pi,pi])
axis equal;