MATLAB: How to plot sphere in sphere coordinates

MATLABplottingsphere

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?

Best Answer

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

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St11=100;
Sc11=St11*2/3;
St22=80;
Sc22=St22*2/3;
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for phi=0:pi/50:2*pi
    i1 = i1+1;
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        X=Sc11;
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        Y=Sc22;
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[psi,phi] = meshgrid(-pi/2:pi/50:pi/2,0:pi/50:2*pi);
x=cos(psi).*cos(phi).*r;
y=cos(psi).*sin(phi).*r;
z=sin(psi).*r;
surf(x,y,z)

Best Answer

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