Robin2:
I don't think you have told us this before. What is that about? What are you planning to compare?
We have theoretical path on software generated by different algorithms , a way point set. And we have robot in real world. So. Robot take decision "which way to go" - based on real word situation - sensor data etc. And we want to compare how much randomly exist factors of real world (cat on way of robot as example 
) - make a distortion of theoretical path.
Sorry but i don't have English skill to explain that....