galpy.potential.Potential.dvcircdR¶
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Potential.
dvcircdR
(R, phi=None, t=0.0)[source]¶ NAME:
dvcircdRPURPOSE:
calculate the derivative of the circular velocity at R wrt R in this potentialINPUT:
R - Galactocentric radius (can be Quantity)
phi= (None) azimuth to use for non-axisymmetric potentials
t - time (optional; can be Quantity)
OUTPUT:
derivative of the circular rotation velocity wrt RHISTORY:
2013-01-08 - Written - Bovy (IAS)
2016-06-28 - Added phi= keyword for non-axisymmetric potential - Bovy (UofT)