Have you checked the actual value of sigma being used by the vehicles in the type parameter dialog of sumo-gui?
Am Mi., 22. Feb. 2023 um 14:38 Uhr schrieb Mahima <[email protected]>: > But I am keeping sigma = 0. > > For sigma 0, vMax should be used as next speed and not vDawdle. > vDawdle = MAX2(vMin, dawdle2(vMax, sigma, veh->getRNG())); > > On Wed, Feb 22, 2023 at 4:32 PM Jakob Erdmann <[email protected]> > wrote: > >> > This randomness calculation should be off when we use --random false. >> No. This is not what option --random does. >> Please see https://sumo.dlr.de/docs/Simulation/Randomness.html >> As long as vehicles have sigma > 0 (default is 0.5) there will be random >> speed fluctuations between your partitions. >> >> Am Mi., 22. Feb. 2023 um 14:23 Uhr schrieb Mahima <[email protected]>: >> >>> Hi, >>> >>> We have developed a parallel framework over SUMO. When I am copying >>> vehicles from one partition to another. With the vehicles I am also copying >>> the following lane change parameters. I am keeping sigma 0, --random false >>> and same seed value for all the partitions and sequential SUMO. >>> >>> "laneChangeModel.speedGainProbabilityRight" >>> "laneChangeModel.keepRightProbability" >>> "laneChangeModel.lookAheadSpeed" >>> >>> After adding vehicles in the next partition, I am also moving them for >>> the desired position in the current step and setting speed for the current >>> step. >>> i am calculating the current step speed as follows: >>> >>> double vthis=LastTimestepSpeed+ACCEL2SPEED(LastTimestepAcceleration); >>> Or if the vehicle has a Leader...then with the follow speed. >>> >>> But if I compare travel time of this parallel framework with sequential >>> SUMO, I am getting an accuracy error. >>> >>> I have found that patchSpeedBeforeLC is calculating some different speed >>> which is causing randomness. >>> >>> vDawdle = MAX2(vMin, dawdle2(vMax, sigma, veh->getRNG())); >>> >>> This randomness calculation should be off when we use --random false. >>> >>> Thanks, >>> Mahima >>> >>> On Wed, Feb 22, 2023 at 1:41 PM Jakob Erdmann <[email protected]> >>> wrote: >>> >>>> The function getStopSpeed is not only used for <stop> elements but also >>>> for approaching intersections where a vehicle needs to come to a stop. >>>> From your description it is not clear what exactly you are doing and >>>> why you are observing a differences between some speeds and some other >>>> speeds. >>>> >>>> >>>> Am Di., 21. Feb. 2023 um 14:24 Uhr schrieb Mahima <[email protected]>: >>>> >>>>> Thanks for your reply. >>>>> Yes, sigma is already set as 0. The only difference I can see is the >>>>> stop speed (getStopSpeed) is different. >>>>> >>>>> How can I set the stop speed of a vehicle? Is it by using >>>>> libsumo::Vehicle::setStopParameter? But then I need to define the stop >>>>> first...correct? >>>>> >>>>> Thanks. >>>>> >>>>> On Sun, Feb 19, 2023 at 3:28 PM Jakob Erdmann <[email protected]> >>>>> wrote: >>>>> >>>>>> > Why does the vehicle need information about the vehicle on the >>>>>> previous edge for the car following model speed calculation? >>>>>> This is likely a misunderstanding. What gives you that impression? >>>>>> >>>>>> > How can I set the car following model parameters from the previous >>>>>> partition to the master partition such that it gives the same speed >>>>>> calculation of a vehicle? >>>>>> The default car-following model doesn't have internal state so it >>>>>> should reproduce the same behavior when faced with the same situation >>>>>> (distance, ego speed, leader speed, deceleration capabilities, >>>>>> speedFactor). A possible cause for difference is the random component >>>>>> (sigma). You can check whether the differences are due to randomness by >>>>>> setting sigma=0. >>>>>> >>>>>> Am So., 19. Feb. 2023 um 11:36 Uhr schrieb Mahima <[email protected] >>>>>> >: >>>>>> >>>>>>> Hi, >>>>>>> >>>>>>> Why does the vehicle need information about the vehicle on the >>>>>>> previous edge for the car following model speed calculation? >>>>>>> How can I set the car following model parameters from the previous >>>>>>> partition to the master partition such that it gives the same speed >>>>>>> calculation of a vehicle? >>>>>>> >>>>>>> Thanks >>>>>>> >>>>>>> On Wed, Sep 28, 2022 at 9:48 AM Jakob Erdmann <[email protected]> >>>>>>> wrote: >>>>>>> >>>>>>>> using getParameter / setParameter with the following values should >>>>>>>> be enough for the default lanechangem model: >>>>>>>> "laneChangeModel.speedGainProbabilityRight" >>>>>>>> "laneChangeModel.keepRightProbability" >>>>>>>> "laneChangeModel.lookAheadSpeed" >>>>>>>> >>>>>>>> Am Mo., 26. Sept. 2022 um 09:58 Uhr schrieb Mahima < >>>>>>>> [email protected]>: >>>>>>>> >>>>>>>>> When I am copying a vehicle from one partition to the other on the >>>>>>>>> same lane and position as it was on the previous partition, but in the >>>>>>>>> current timestep if there was a lane change decision in the previous >>>>>>>>> partition......which lane change API or flag will give me the same >>>>>>>>> lane >>>>>>>>> change decision in the master partition. >>>>>>>>> In this scenario, I am already making sure that the neighbouring >>>>>>>>> vehicles for this vehicle are the same as on the previous partition. >>>>>>>>> >>>>>>>>> Please suggest. >>>>>>>>> >>>>>>>>> On Mon, Sep 26, 2022 at 9:39 AM Jakob Erdmann < >>>>>>>>> [email protected]> wrote: >>>>>>>>> >>>>>>>>>> No. TraCI runs before the computation of this step's values ( >>>>>>>>>> https://sumo.dlr.de/docs/Developer/Implementation_Notes/Simulation_Loop.html#main_vehicle_update_loop >>>>>>>>>> ) >>>>>>>>>> >>>>>>>>>> Am So., 25. Sept. 2022 um 11:02 Uhr schrieb Mahima < >>>>>>>>>> [email protected]>: >>>>>>>>>> >>>>>>>>>>> Hi, >>>>>>>>>>> >>>>>>>>>>> Is there any way to read the vehicle's speed, lane and position >>>>>>>>>>> in the current timestep? >>>>>>>>>>> >>>>>>>>>>> libsumo::Vehicle::getLanePosition >>>>>>>>>>> libsumo::Vehicle::getSpeed >>>>>>>>>>> All these APIs, give information about the last timestep. >>>>>>>>>>> >>>>>>>>>>> Thanks >>>>>>>>>>> _______________________________________________ >>>>>>>>>>> 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 >>>>>>>> >>>>>>> _______________________________________________ >>>>>>> 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 >>>> >>> _______________________________________________ >>> 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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