galpy.potential.evaluateplanarR2derivs¶

galpy.potential.evaluateplanarR2derivs(Pot, R, phi=None, t=0.0)[source]¶

Evaluate the second radial derivative of planarPotential instance(s).

Parameters:

Pot (planarPotential instance or a combined potential formed using addition (pot1+pot2+…)) – The potential(s) to evaluate.
R (float or Quantity) – Cylindrical radius
phi (float or Quantity, optional) – Azimuth (default: None)
t (float or Quantity, optional) – Time (default: 0.0)

Returns:

The second potential derivative d2Phi/dR2(R, phi, t).

Return type:

float or Quantity

Notes