How to plot sphere in sphere coordinates?

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Niklas Kurz
Niklas Kurz 2020-10-18
评论： Bruno Luong 2020-10-21
I'm just trying to plot known sphere coordinates:
function sphere(r)
phi = linspace(0,2*pi);
theta = linspace(0,pi);
x = r*cos(phi).*sin(theta);
y = r*sin(phi).*sin(theta);
z = r*cos(theta);
plot3(x,y,z)
end
However this isn't doing the trick. What have I mathematically confounded?

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采纳的回答

J. Alex Lee
J. Alex Lee 2020-10-19
Your problem is not with conversion or plotting, but defining the coordinates that you want...
[phi,theta] = meshgrid(linspace(0,2*pi),linspace(0,pi));
Also if you didn't know:
https://www.mathworks.com/help/matlab/ref/sph2cart.html
  2 个评论
Niklas Kurz
Niklas Kurz 2020-10-21
yea, but I wanted to go through the rough way ;)
You could have said additionally that I need to swap plot3(x,y,z) with mesh(x,y,z), but all in all you've been nudging me in the right direction. Thx
J. Alex Lee
J. Alex Lee 2020-10-21
sure thing. if you decide you don't want the rough way and you haven't seen it, check
https://www.mathworks.com/help/matlab/ref/sphere.html
[X,Y,Z] = r*sphere(n)
mesh(X,Y,Z)
% surf(X,Y,Z) % filled in faces
Also check out
https://www.mathworks.com/matlabcentral/fileexchange/50105-icosphere

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更多回答（1 个）

Bruno Luong
Bruno Luong 2020-10-21
function sphere(r)
phi = linspace(0,2*pi);
theta = linspace(0,pi).'; % first change
x = r*cos(phi).*sin(theta);
y = r*sin(phi).*sin(theta);
z = r*cos(theta)+0*phi; % second change, make z same-size 2d array as x and y
plot3(x,y,z);
end
  3 个评论
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