How to plot sphere in sphere coordinates?
显示 更早的评论
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?
采纳的回答
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:
2 个评论
Niklas Kurz
2020-10-21
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
[X,Y,Z] = r*sphere(n)
mesh(X,Y,Z)
% surf(X,Y,Z) % filled in faces
Also check out
更多回答（1 个）
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
J. Alex Lee
2020-10-21
nice. might be confusing depending on the audience though :)
As a side note, I wish plot also supported "implicit expansion" so you don't have to make the second change. As long as we have committed to the silent syntax, why not go the full nine yards!
Niklas Kurz
2020-10-21
Bruno Luong
2020-10-21
Click on .'
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