galpy.potential.planarPotential.__call__

planarPotential.__call__(R, phi=0.0, t=0.0, dR=0, dphi=0)

NAME:

__call__

PURPOSE:

evaluate the potential

INPUT:

R - Cylindrica radius

phi= azimuth (optional)

t= time (optional)

dR=, dphi= if set to non-zero integers, return the dR,dphi’t derivative

OUTPUT:

Phi(R(,phi,t)))

HISTORY:

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