galpy.potential.Potential.phiforce¶
-
Potential.
phiforce
(R, z, phi=0.0, t=0.0)[source]¶ NAME:
phiforcePURPOSE:
evaluate the azimuthal force F_phi = -d Phi / d phi (R,z,phi,t) [note that this is a torque, not a force!)INPUT:
R - Cylindrical Galactocentric radius (can be Quantity)
z - vertical height (can be Quantity)
phi - azimuth (rad; can be Quantity)
t - time (optional; can be Quantity)
OUTPUT:
F_phi (R,z,phi,t)HISTORY:
2010-07-10 - Written - Bovy (NYU)