galpy.util.bovy_coords.Rz_to_coshucosv

galpy.util.bovy_coords.Rz_to_coshucosv(R, z, delta=1.0)

NAME:

Rz_to_coshucosv

PURPOSE:

calculate prolate confocal cosh(u) and cos(v) coordinates from R,z, and delta

INPUT:

R - radius

z - height

delta= focus

OUTPUT:

(cosh(u),cos(v))

HISTORY:

2012-11-27 - Written - Bovy (IAS)