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clear;clc;
%x=-3:0.1:3;y=-3:0.1:3;
z=0:0.1:5;
t=0:0.1:pi*2;
x=sin(t);y=cos(t);
grid on;
[x,y,z]=meshgrid(x,y,z);
f=x.^2+y.^2-1;
p=patch(isosurface(x,y,z,f,0));
set(p,'FaceColor','r','EdgeColor','none');
%hold on;
daspect([1 1 1])
axis([-2 2 -2 2 0 5.5])
view(3)
camlight;lighting phong
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