code: def evaluateplanarRforces(Pot,R,phi=None,t=0.):
      
      return _evaluateplanarRforces(Pot,R,phi=phi,t=t)
docs: NAME:
  
         evaluateplanarRforces
  
      PURPOSE:
  
         evaluate the Rforce of a (list of) planarPotential instance(s)
  
      INPUT:
  
         Pot - (list of) planarPotential instance(s)
  
         R - Cylindrical radius (can be Quantity)
  
         phi= azimuth (optional can be Quantity)
  
         t= time (optional; can be Quantity)
  
      OUTPUT:
  
         F_R(R(,phi,t))
  
      HISTORY:
  
         2010-07-13 - Written - Bovy (NYU)