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on 21 Oct 2021
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l=@(n)linspace(0,n,100);
[a,t]=meshgrid(l(360),l(90));
c=cosd(t);
x=cosd(a);
y=sind(a);
z=f(t);
u=surf(x.*c,y.*c,z);
hold on;
t=t/45;
v=surf(x.*t,y.*t,-t);
s=@(p,c)set(p,'facecolor',c,'edgecolor','none');
s(u,'b');s(v,'y');
view(0,5);
light;
set([gcf gca],'color','k');
function z=f(t)
z=sind(t)/3;
z(t>65)=0.5;
end
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