galpy.potential.planarPotential.phitorque¶
- planarPotential.phitorque(R, phi=0.0, t=0.0)[source]¶
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)