galpy.potential.Potential.r2deriv¶
- Potential.r2deriv(R, z, phi=0.0, t=0.0)[source]¶
NAME:
r2deriv
PURPOSE:
evaluate the second spherical radial derivative
INPUT:
R - Cylindrical Galactocentric radius (can be Quantity)
z - vertical height (can be Quantity)
phi - azimuth (optional; can be Quantity)
t - time (optional; can be Quantity)
OUTPUT:
d2phi/dr2
HISTORY:
2018-03-21 - Written - Webb (UofT)