code: def plot_fft(f, S, dt):
      '''Plot fft
  
      Args
      ----
      f: ndarray
          Array of frequencies produced with PSD
      S: ndarray
          Array of powers produced with PSD
      dt: ndarray
          Sampling rate of sensor
      '''
      import numpy
  
      xf = numpy.linspace(0.0, 1/(2.0*dt), N/2)
      plt.plot(xf, 2.0/N * numpy.abs(S[:N//2]), linewidth=_linewidth)
      plt.show()
  
      return Nonf plot_fft(f, S, dt):
      '''Plot fft
  
      Args
      ----
      f: ndarray
          Array of frequencies produced with PSD
      S: ndarray
          Array of powers produced with PSD
      dt: ndarray
          Sampling rate of sensor
      '''
      import numpy
  
      xf = numpy.linspace(0.0, 1/(2.0*dt), N/2)
      plt.plot(xf, 2.0/N * numpy.abs(S[:N//2]), linewidth=_linewidth)
      plt.show()
  
      return None
docs: Plot fft
  
      Args
      ----
      f: ndarray
          Array of frequencies produced with PSD
      S: ndarray
          Array of powers produced with PSD
      dt: ndarray
          Sampling rate of sensor