code: def fx(x, dt):
      """state transition function"""
  
      # pos = pos + vel
      # vel = vel
      return array([x[0] + x[1], x[1]])
  
file_path: filterpy/filterpy/examples/bearing_only.py
imports: import math
  from numpy import array, asarray
  from numpy.random import randn
  import matplotlib.pyplot
  from filterpy.kalman import UnscentedKalmanFilter
  from filterpy.kalman import ScaledUnscentedKalmanFilter
  from filterpy.common import Q_discrete_white_noise
label_desc: Use image node_id 1 for calling a global function with example usage: fx(x, dt) and returns: array