mpower Inputs must be 2-D.[x,y,z]=meshgrid(linspac

mpower Inputs must be 2-D.[x,y,z]=meshgrid(linspace(-3,3,120));f=sqrt((x-5)^2+(y-6)^2+(z-7)^2)+sqrt((x-15)^2+(y-16)^2+(z-17)^2)-30;p=patch(isosurface(x,y,z,f,0));set(p,'Fac