galpy.potential.planarPotential.Rforce
galpy.potential.planarAxiPotential.lindbladR
Potential.
epifreq
NAME:
PURPOSE:
calculate the epicycle frequency at R in this potential
INPUT:
R - Galactocentric radius
OUTPUT:
epicycle frequency
HISTORY:
2011-10-09 - Written - Bovy (IAS)