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 >
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