NAME:
dens
PURPOSE:
evaluate the density rho(R,z,t)
INPUT:
R - Cylindrical Galactocentric radius
z - vertical height
phi - azimuth (optional)
t - time (optional)
KEYWORDS:
forcepoisson= if True, calculate the density through the Poisson equation, even if an explicit expression for the density exists
OUTPUT:
rho (R,z,phi,t)
HISTORY:
2010-08-08 - Written - Bovy (NYU)