galpy.potential.Potential.R2deriv¶
-
Potential.
R2deriv
(R, Z, phi=0.0, t=0.0)¶ NAME:
R2derivPURPOSE:
evaluate the second radial derivativeINPUT:
R - Galactocentric radius (can be Quantity)
Z - vertical height (can be Quantity)
phi - Galactocentric azimuth (can be Quantity)
t - time (can be Quantity)
OUTPUT:
d2phi/dR2HISTORY:
2011-10-09 - Written - Bovy (IAS)