docs: def prh(ax, ay, az):
      '''Calculate the pitch, roll and heading for triaxial movement signalsi
  
      Args
      ----
      ax: ndarray
          x-axis acceleration values
      ay: ndarray
          y-axis acceleration values
      az: ndarray
          z-axis acceleration values
  
      Returns
      -------
      pitch: ndarray
          Pitch angle in radians
      roll: ndarray
          Pitch angle in radians
      yaw: ndarray
          Pitch angle in radians
      '''
  
      p = pitch(ax, ay, az)
      r = roll(ax, ay, az)
      y = yaw(ax, ay, az)
  
      #from dtag_toolbox_python.dtag2 import a2pr
      #pitch, roll, A_norm = a2pr.a2pr(A_g)
  
      return p, r, y