galpy.potential.Potential.phiforce
galpy.potential.Potential.plot
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NAME:
phi2deriv
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)