galpy.potential.Potential.plotRotcurve
galpy.potential.Potential.Rzderiv
Potential.
R2deriv
NAME:
PURPOSE:
evaluate the second radial derivative
INPUT:
R - Galactocentric radius Z - vertical height phi - Galactocentric azimuth t - time
R - Galactocentric radius
Z - vertical height
phi - Galactocentric azimuth
t - time
OUTPUT:
d2phi/dR2
HISTORY:
2011-10-09 - Written - Bovy (IAS)