text: import sys
  import numpy as np
  
  class wakeRollup():
      
      def __init__(self, wingSolution, wingKinematics, wakeConvection):
          
          self.wingSolution = wingSolution
          self.wingKinematics = wingKinematics
          self.wakeConvection = wakeConvection
          
          
          
          self.knownShedVortexCirculation = self.getKnownShedVortexCirculation()
          self.knownShedVortexPtEarth = self.getKnownShedVortexPtEarth()
  
      def getKnownShedVortexCirculation(self):
          
          knownShedVortexCirculation =  self.wingSolution.circulation[-1]
      
          return knownShedVortexCirculation
  
      def getKnownShedVortexPtEarth(self):
          
          if self.wakeConvection == "no":
                      
              knownShedVortexPtEarth = np.zeros(2)
              
              knownShedVortexPtEarth[:] = self.wingKinematics.unknownShedVortexPtEarth[:]
              
              return knownShedVortexPtEarth
          
          elif self.wakeConvection == "yes":
              print('\n')
              sys.exit('SYSTEM EXIT --> Error: Wake Convection Is Not Yet Implemented !!!')
          else:
              print('\n')
              sys.exit('SYSTEM EXIT --> Error: Wake Convection Must Be "yes" Or "no" !!!')
  