Re: [sumo-user] --seed and --random

[Jakob Erdmann <namdre.sumo@xxxxxxxxx>]

1) by running sumo with different values of --seed you can get different simulation behavior (randomness). Running it twice with the same seed gives the same results so each run is still reproducible. Running sumo with --random will pick a different random seed each time. You don't have to change the seed each time which makes this more convenient but you cannot reproduce your runs.

2) If the flow is defined with attribute 'probability', then the number and insertion times of vehicles will change. With default settings, the vehicle speeds will be different (maximum speeds due to random speedFactor and actual step-by-step speeds due to random fluctuation). This may also impact insertion times for dense flows but will not affect vehicle count.

regards,

Jakob

Am Do., 11. März 2021 um 17:46 Uhr schrieb ali mirzaei <alimrz222@xxxxxxxxx>:

Hello,

My new questions are in two parts:

1- Despite reading --seed and --random in https://sumo.dlr.de/docs/sumo.html#input, unfortunately, I didn't get the point. I mean the difference between these two tools of making a run randomized. Which one precedes the other? What is the relationship between them? What shall I do if I want to make my run completely randomized? 

2- What attributes of flow are randomized when I change the seed(random) tool?

Regards,

Ali

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