code: def sweep_genXs(self):
          
          if self.decimateMethod:
              self.dataX=np.arange(len(self.dataY))/self.rate
              self.dataX*=self.decimateBy
              return
          if self.dataX is None or len(self.dataX)!=len(self.dataY):
              self.dataX=np.arange(len(self.dataY))/self.rate
docs: generate sweepX (in seconds) to match sweepY