Thank you Mirko. I made a mistake while writing the mail (sorry!), here is the correct probability of insertion, corresponding to the graphs I sent: <flow id="517" type="vehDist_IDM_bus" line="517" begin="0.00" route="Ruta_517" end="4500" probability="0.0155" /> <flow id="518" type="vehDist_IDM_bus" line="518" begin="0.00" route="Ruta_518" end="4500" probability="0.0155" />
With these probabilities, it's "expected" to get around 110 buses per hour. I will try the solution provided, using *--random-depart-offset* *<TIME>* <https://sumo.dlr.de/docs/Basics/Notation.html#referenced_data_types>.. Thank you, Kind regards El mié, 27 jul 2022 a las 14:43, Mirko Barthauer (<[email protected]>) escribió: > Although I don't get how you obtain several dozens of buses with twice the > insertion probability of 0,0015. With very small flows, the relative > variance can get quite large, so for some simulations, it might just be 10 > vehicles in total and 30 in others, but never 110. > > Anyway, see the docs <https://sumo.dlr.de/docs/Simulation/Randomness.html>for > some suggestions how to procede. If you only have buses, maybe just insert > them at regular intervals and add an offset *--random-depart-offset* > *<TIME>* > <https://sumo.dlr.de/docs/Basics/Notation.html#referenced_data_types>. > > Best regards > Mirko > Am 27.07.2022 um 15:35 schrieb Jaime Moya: > > Hi Mirko, > > The scenario consists of a one lane road where only buses are being > modelled. The flows vary between 10 b/h and 110 b/h. > > The buses are inserted at the route begin and there is no spillback. On > the following image, I plotted the cumulative number of buses for each line > (each graph is a replication) > [image: image.png] > As you can see, more 517 buses are inserted in almost all cases. Could it > be related to randomness? How can I balance the number of buses, > without inserting them at regular intervals? > > Thanks in advance, > > Kind regards > > -- > Jaime Moya > Pontificia Universidad Católica de Chile > > > El mar, 26 jul 2022 a las 3:13, [email protected] (< > [email protected]>) escribió: > >> Hi Jaime, >> >> >> >> that's difficult to guess without knowing more about your scenario. Did >> you check whether the buses are inserted at the route begin at all? Maybe >> there is a spillback queue or many other vehicles want to enter the >> simulation at the same place, such that SUMO cannot place new vehicles on >> the road safely. If your network is too big to do this manually, think of >> placing >> a detector >> <https://sumo.dlr.de/docs/Simulation/Output/Induction_Loops_Detectors_%28E1%29.html> >> (with attribute vTypes="vehDist_IDM_bus") at the route begin or adding FCD >> output <https://sumo.dlr.de/docs/Simulation/Output/FCDOutput.html> to >> your bus vehicle type to get relevant output for further diagnosis. >> >> >> >> Mirko >> >> >> >> >> >> >> >> >> >> >> >> -----Original-Nachricht----- >> >> Betreff: [sumo-user] Modelling two bus lines of equal frequency >> >> Datum: 2022-07-25T18:59:30+0200 >> >> Von: "Jaime Moya" <[email protected]> >> >> An: "Sumo project User discussions" <[email protected]> >> >> >> >> >> >> >> Hi, >> >> I am modelling two bus lines of equal frequency, but different stop times >> at bus stops. To avoid buses being inserted at perfect regular times, I am >> using probability: >> >> <flow id="517" type="vehDist_IDM_bus" line="517" begin="0.00" >> route="Ruta_517" end="4500" probability="0.0015" /> >> <flow id="518" type="vehDist_IDM_bus" line="518" begin="0.00" >> route="Ruta_518" end="4500" probability="0.0015" /> >> >> However, in many scenarios I am obtaining big differences in the number >> of simulated buses of one line with respect to the other (line 517 vs line >> 518). For example, the following graph shows the difference (number of 517 >> buses minus number of 518 buses) for a number of simulated scenarios: >> [image: image.png] >> >> These differences are important because I am getting results with noise. >> I don't want to use "vehsPerHour" or "number" because the buses would be >> equally spaced. Should I use period [exp(x)]? Doing so would balance the >> number of 517 and 518 simulated buses? >> >> Thanks in advance. >> >> Kind regards, >> >> -- >> Jaime Moya >> Pontificia Universidad Católica de Chile >> >> >> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> >> Libre >> de virus. www.avast.com >> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail> >> >> >> >> _______________________________________________ >> 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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