galpy.potential.Potential.phiforce
galpy.potential.Potential.plot
Potential.
phi2deriv
NAME:
PURPOSE:
evaluate the second azimuthal derivative
INPUT:
R - Galactocentric radius Z - vertical height phi - Galactocentric azimuth t - time
R - Galactocentric radius
Z - vertical height
phi - Galactocentric azimuth
t - time
OUTPUT:
d2Phi/dphi2
HISTORY:
2013-09-24 - Written - Bovy (IAS)