galpy.potential.dvcircdR¶
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galpy.potential.
dvcircdR
(Pot, R, phi=None)¶ NAME:
dvcircdRPURPOSE:
calculate the derivative of the circular velocity wrt R at R in potential PotINPUT:
Pot - Potential instance or list of such instances
R - Galactocentric radius (can be Quantity)
phi= (None) azimuth to use for non-axisymmetric potentials
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)