galpy.potential.Potential.r2derivΒΆ

Potential.r2deriv(R, z, phi=0.0, t=0.0)[source]ΒΆ

NAME:

r2deriv

PURPOSE:

evaluate the second spherical radial derivative

INPUT:

R - Cylindrical Galactocentric radius (can be Quantity)

z - vertical height (can be Quantity)

phi - azimuth (optional; can be Quantity)

t - time (optional; can be Quantity)

OUTPUT:

d2phi/dr2

HISTORY:

2018-03-21 - Written - Webb (UofT)