Plotting a section of a hemisphere using parametric equations

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Marcus Velling
Marcus Velling 2020-4-30
回答： Carlos Guerrero García 2022-11-16
Using:
theta=[0:0.1:2*pi];
phi=[0:0.1:pi/4];
R=1;
[THETA,PHI]=meshgrid(theta,phi);
X1=R.*cos(THETA).*sin(PHI);
Y1=R.*sin(THETA).*sin(PHI);
Z1=R.*cos(PHI);
surf(X1,Y1,Z1)
I get a section of a sphere, but a slit is missing from the plot. How do i fill in the slit?

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采纳的回答

David Goodmanson
David Goodmanson 2020-4-30
Hi Marcus
theta=[0:0.01:1]*2*pi;
ensures that the value of 2*pi is reached.

更多回答（1 个）

Carlos Guerrero García
Another way for changing the theta and/or phi values is
theta=[0:pi/36:2*pi];
phi=[0:pi/36:pi/4];
Anyway, I suggest not to create a vector for theta and another vector for phi only for making the meshgrid. I suggest changing that lines as follows:
[THETA,PHI]=meshgrid(0:pi/36:2*pi,0:pi/36:pi/4);
R=1;
X1=...

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