galpy.potential.Potential.Rphideriv

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

NAME:

Rphideriv

PURPOSE:

evaluate the mixed radial, azimuthal derivative

INPUT:

R - Galactocentric radius (can be Quantity)

Z - vertical height (can be Quantity)

phi - Galactocentric azimuth (can be Quantity)

t - time (can be Quantity)

OUTPUT:

d2Phi/dphidR

HISTORY:

2014-06-30 - Written - Bovy (IAS)