galpy.potential.planarPotential.phitorque

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

NAME:

phitorque

PURPOSE:

evaluate the azimuthal torque = - d Phi / d phi

INPUT:

R - Cylindrical radius (can be Quantity)

phi= azimuth (optional; can be Quantity)

t= time (optional; can be Quantity)

OUTPUT:

tau_phi(R,(phi,t)))

HISTORY:

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