Transform from Cartesian to polar (cylindrical) coordinates.
[theta, rho [, z]] = mathieu_cart2pol(x, y [, z])
Cartesian x.
Cartesian y.
(optional) Cartesian z.
polar angle.
polar radius.
(optional) polar height.
Transform from Cartesian coordinates to polar (or cylindrical) using the following formulas:
;
;
R.Coisson and G. Vernizzi, Parma University
X. K. Yang
2011 - DIGITEO - Michael Baudin
N. O. Strelkov, NRU MPEI