code: def set_input(self, nr=2, qd=1, b=0):
          
          self.nr = nr
          self.qd = qd
          self.b = b
docs: Set inputs after initialization
  
          Parameters
          -------
          nr: integer
              length of generated time-series
              number must be power of two
          qd: float
              discrete variance
          b: float
              noise type:
                  0 : White Phase Modulation (WPM)
                 -1 : Flicker Phase Modulation (FPM)
                 -2 : White Frequency Modulation (WFM)
                 -3 : Flicker Frequency Modulation (FFM)
                 -4 : Random Walk Frequency Modulation (RWFM)