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[a,z]=ndgrid((0:.02:1)*2*pi,0:.05:1);
x=cos(a);
y=sin(a);
surf(x,y,z,x*0)
hold on
[a,r]=ndgrid((0:.02:1)*2*pi,[0 1]);
x=cos(a).*r;
y=sin(a).*r;
surf(x,y,x*0,x*0)
surf(x,y,x*0+1,x*0)
hold on
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