galpy.potential.Potential.phi2deriv¶
- Potential.phi2deriv(R, z, phi=0.0, t=0.0)[source]¶
Evaluate the second azimuthal derivative.
- Parameters:
R (float or Quantity) – Cylindrical Galactocentric radius.
z (float or Quantity) – Vertical height.
phi (float or Quantity, optional) – Azimuth (default: 0.0).
t (float or Quantity, optional) – Time (default: 0.0).
- Returns:
d2Phi/dphi2.
- Return type:
float or Quantity
Notes
2013-09-24 - Written - Bovy (IAS)