galpy.potential.Potential.R2deriv¶
- Potential.R2deriv(R, z, phi=0.0, t=0.0)[source]¶
Evaluate the second radial derivative.
- Parameters:
R (float or Quantity) – Galactocentric radius.
z (float or Quantity) – Vertical height.
phi (float or Quantity, optional) – Galactocentric azimuth (default: 0.0).
t (float or Quantity, optional) – Time (default: 0.0).
- Returns:
d2phi/dR2.
- Return type:
float or Quantity
Notes
2011-10-09 - Written - Bovy (IAS)