Whenever a type is sampled from a distribution, the state of one of the random number generators changes. This can have far-reaching effects on other parts of the simulation that use the same random number generator (i.e. speedFactor distribution).
Am Do., 20. Mai 2021 um 14:08 Uhr schrieb Bae, Jong In <[email protected]>: > Hello, > > I have some questions about how using vTypeDistribution may introduce > randomness in simulation even if the seed value and the > random-depart-offset value were kept the same. > My experiment is a 2-lane highway. "HVexit" vehicles merge into lane 0 to > exit the highway. > > The attached screenshot shows the vTypeDistributions in my experiment. The > two vehicle types (AV and HV) have the identical properties. Thus, they > should behave identically. > > In my next experiment, my "HVexit" volume was kept the same and all the > other volumes changed. However, the volume changes were made in a way that > the total volume of each approach (thru and exit) as well as the total lane > volume were kept the same. > > In other words, the road conditions (lane volumes) were kept the same - > it's just the vehicle compositions changed but the two vehicle types behave > identically. > I would expect that these two experiments would have the exact same > results. The seed value and the random-depart-offset value were kept the > same. > > However, the number of vehicles processed (completed their routes) and the > average travel time of "HVexit" were slightly different. > I was wondering if using multiple vTypeDistirbution introduced randomness > in the simulation. > > I know my question was lengthy. Please let me know if I can clarify my > question in any way. > > Thank you so much in advance for your help! > > _______________________________________________ > sumo-user mailing list > [email protected] > To unsubscribe from this list, visit > https://www.eclipse.org/mailman/listinfo/sumo-user >
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