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- z = [-1:0.1:1];
- theta = [0:pi/18:2*pi];
- [R, THETA] = meshgrid(z, theta);
- X = R.*cos(THETA);
- Y = R.*sin(THETA);
- Z = sqrt(1-R.^2);
- mesh(X, Y, Z);
- hold on
- mesh(X, Y, -Z);
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