galpy.potential.Potential.z2deriv¶
-
Potential.
z2deriv
(R, z, phi=0.0, t=0.0)[source]¶ NAME:
z2derivPURPOSE:
evaluate the second vertical 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/dz2HISTORY:
2012-07-25 - Written - Bovy (IAS@MPIA)