galpy.potential.evaluateplanarR2derivs

galpy.potential.evaluateplanarR2derivs(R, Pot, phi=None, t=0.0)

NAME:

evaluateplanarR2derivs

PURPOSE:

evaluate the second radial derivative of a (list of) planarPotential instance(s)

INPUT:

R - Cylindrical radius

Pot - (list of) planarPotential instance(s)

phi= azimuth (optional)

t= time (optional)

OUTPUT:

F_R(R(,phi,t))

HISTORY:

2010-10-09 - Written - Bovy (IAS)