galpy.potential.Potential.r2deriv

Potential.r2deriv(R, z, phi=0.0, t=0.0)

Evaluate the second spherical radial 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/dr2.

Return type:

float or Quantity

Notes

• 2018-03-21 - Written - Webb (UofT)