galpy.potential.planarPotential.phiforce¶
-
planarPotential.
phiforce
(R, phi=0.0, t=0.0)[source]¶ NAME:
phiforcePURPOSE:
evaluate the phi force = - d Phi / d phi (note that this is a torque, not a force!)INPUT:
R - Cylindrical radius (can be Quantity)
phi= azimuth (optional; can be Quantity)
t= time (optional; can be Quantity)
OUTPUT:
F_phi(R,(phi,t)))HISTORY:
2010-07-13 - Written - Bovy (NYU)