galpy.potential.planarPotential.phiforce

planarPotential.phiforce(R, phi=0.0, t=0.0)

NAME:

phiforce

PURPOSE:

evaluate the phi force

INPUT:

R - Cylindrical radius

phi= azimuth (optional)

t= time (optional)

OUTPUT:

F_phi(R,(phi,t)))

HISTORY:

2010-07-13 - Written - Bovy (NYU)