galpy.util.bovy_coords.rphi_to_dl_2d
galpy.util.bovy_coords.Rz_to_uv
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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
R - radius
z - height
delta= focus
OUTPUT:
(cosh(u),cos(v))
HISTORY:
2012-11-27 - Written - Bovy (IAS)