Please provide input files for both experiments. Am Mi., 26. Mai 2021 um 08:51 Uhr schrieb Bae, Jong In <[email protected]>:
> Thanks Jakob for pointing out the error. > > I added the flows that use my vTypeDistribution. Also, I put both vehicle > types under one vTypeDistribution as you suggested in the earlier email. My > new rou.file screenshot is attached. > > However, I'm still seeing some differences (# of vehicles processed as > well as average travel time of a particular vehicle group) between the > experiment runs. > > Would there be anything else in my rou.file that may be creating the > difference? The only thing I'm changing between the experiments is the > proportion of the vehicle type in each direction (thru and exit) while > keeping the total volume the same. > > Since the two vehicle types have identical properties, I'm expecting to > see the same results across the experiments. > > Any suggestion would be greatly appreciated! > > ------------------------------ > *From:* sumo-user <[email protected]> on behalf of Jakob > Erdmann <[email protected]> > *Sent:* Tuesday, May 25, 2021 4:22 AM > *To:* Sumo project User discussions <[email protected]> > *Subject:* Re: [sumo-user] Using vTypeDistribution > > Your input is lacking any <vehicle>, <flow> or <trip> defintions that use > your vTypeDistribution. > > Am Fr., 21. Mai 2021 um 16:30 Uhr schrieb Bae, Jong In <[email protected] > >: > > Thank you Jakob for your suggestion! > > I have changed my rou.file so that I'm putting all vehicle types into one > distribution as shown in the attached screenshot. > However, it seems like the way I have set up my rou.file may be incorrect. > > My files are loaded into simulation successfully but the simulation > doesn't run (simulation ends at -0.10). > Since it's not returning any error message, I'm unable to figure out what > the issue is. > > I attached a screenshot of the rou.file as well as the zipped files of my > experiment. > I would appreciate any guidance you can provide. > > Thank you. > ------------------------------ > *From:* sumo-user <[email protected]> on behalf of Jakob > Erdmann <[email protected]> > *Sent:* Friday, May 21, 2021 6:47 AM > *To:* Sumo project User discussions <[email protected]> > *Subject:* Re: [sumo-user] Using vTypeDistribution > > If you keep the number of vTypeDistributions constant, the number of > random calls should be constant as well regardless of how many vehicles are > sampled from each distribution. > A common way to use them is to put all types into one distribution and > them sample each vehicle type from that distribution. > Random depart offset and vTypeDistributions use the same RNG so you won't > get any advantage by using the former without fixing the latter. > > Am Fr., 21. Mai 2021 um 10:58 Uhr schrieb Bae, Jong In <[email protected] > >: > > Thank you for your explanation. > > Does this mean that every time a vehicle is deployed from one of the > vTypeDistribution (each distribution only has one vehicle type in my set > up), the random number generator's state changes? And if the number of > vehicles change in each vTypeDistribution in the next experiment while > maintaining the same lane volume (all vehicles have identical properties), > the roadway condition still changes due to the randomness from the > vTypeDistribution. Is this the correct way of understanding the issue? > > If I am trying to create an identical roadway conditions while changing > the composition of vehicle types (all of them have identical properties), > should I use flow instead of vTypeDistribution? > According to the SUMO documentation, I can use --randomize-flows option to > add randomness. Instead of using this option, can I use the seed value > and the random-depart-offset value (defined in the .sumocfg file) to have > the vehicle depart time the same? > > Thank you so much! > ------------------------------ > *From:* sumo-user <[email protected]> on behalf of Jakob > Erdmann <[email protected]> > *Sent:* Thursday, May 20, 2021 9:12 AM > *To:* Sumo project User discussions <[email protected]> > *Subject:* Re: [sumo-user] Using vTypeDistribution > > 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 > > _______________________________________________ > sumo-user mailing list > [email protected] > To unsubscribe from this list, visit > https://www.eclipse.org/mailman/listinfo/sumo-user > > _______________________________________________ > sumo-user mailing list > [email protected] > To unsubscribe from this list, visit > https://www.eclipse.org/mailman/listinfo/sumo-user > > _______________________________________________ > sumo-user mailing list > [email protected] > To unsubscribe from this list, visit > https://www.eclipse.org/mailman/listinfo/sumo-user >
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