galpy.potential.Potential.R2deriv

Potential.R2deriv(R, Z, phi=0.0, t=0.0)

NAME:

R2deriv

PURPOSE:

evaluate the second radial derivative

INPUT:

R - Galactocentric radius

Z - vertical height

phi - Galactocentric azimuth

t - time

OUTPUT:

d2phi/dR2

HISTORY:

2011-10-09 - Written - Bovy (IAS)