NAME:
evaluateplanarRforces
PURPOSE:
evaluate the Rforce of a (list of) planarPotential instance(s)
INPUT:
R - Cylindrical radius
Pot - (list of) planarPotential instance(s)
phi= azimuth (optional)
t= time (optional)
OUTPUT:
F_R(R(,phi,t))
HISTORY:
2010-07-13 - Written - Bovy (NYU)