I'm currently writing a code of the distribution of an electrical potential as a function of the radius r (as seen in the picture below) and the angle alpha (the angle of the circle, from 0 to 2pi) for a physic problem.
Using the function surf, I can plot the values of this potential at a certain time, as a function of alpha and psi, the radius, but it displays them in a square :
What I would like is to display the same graph, but as a ring form, just like the first picture, so it is more easy to picture the exact place inside the ring the corresponding potential is.
I have currently no idea how to begin. I would really appreciate your help !
Thanks a lot in advance, Best Regards.