galpy.potential.Potential.z2deriv

Potential.z2deriv(R, Z, phi=0.0, t=0.0)

NAME:

z2deriv

PURPOSE:

evaluate the second vertical derivative

INPUT:

R - Galactocentric radius

Z - vertical height

phi - Galactocentric azimuth

t - time

OUTPUT:

d2phi/dz2

HISTORY:

2012-07-25 - Written - Bovy (IAS@MPIA)