Hello dear Jakob,
Actually, my goal is to compare two travel times in two different time
intervals. I mean:
for every 60 seconds:
for each edge:
compute travel tine
store travel time
compare it with the previous 60 seconds
if comparison exceed a threshold
change speed
else
continue simulation
so, for this purpose what is your opinion, can I get travel time for every
60 seconds?
On Fri, Mar 4, 2022 at 3:23 PM Jakob Erdmann <[email protected]> wrote:
> By calling simulationStep within the loop 'for id in
> traci.vehicle.getIDList()' vehicles may leave the simulation area and
> thereby become unavailable for the iteration.
> You could store the positions of all vehicles once, the call
> simulationStep once and then compute whatever you wish to compute for all
> vehicles that are still in the simulation.
> However, I don't think that your code computes something useful. The
> travel time in one time step is always equal to the duration of one time
> step (the avgTT value that you compute may be less since you are only
> looking at x, not y).
>
> Am Do., 3. März 2022 um 10:06 Uhr schrieb amir kr <[email protected]>:
>
>> hello Jakob,
>> yes but I want to calculate travel time in each time step and optimize it
>> and I think fcd output can not change vehicles' positions dynamically.
>> to compute travel time for each vehicle in Traci I used this code:
>> while step < 14000:
>> traci.simulationStep()
>> for id in traci.vehicle.getIDList():
>> pos0 =traci.vehicle.getPosition(id)[0]
>> speed0 =traci.vehicle.getSpeed(id)
>> step += 0.4
>> traci.simulationStep()
>> pos1 =traci.vehicle.getPosition(id)[0]
>> speed1 =traci.vehicle.getSpeed(id)
>> if speed1 == 0:
>> avgTT = 0
>> else:
>> avgTT =(pos1-pos0)/speed1
>> avgTT_list.append(avgTT)
>> print(avgTT_list)
>> step += 0.4
>> but after some time step sumo raise this error
>> raise TraCIException(err, prefix[1], _RESULTS[prefix[2]])
>> traci.exceptions.TraCIException: Vehicle '1.3' is not known.
>> how can I fix it and do you have any suggestions for calculating the
>> travel time of each vehicle in each time step?
>>
>> On Wed, Mar 2, 2022 at 10:00 AM Jakob Erdmann <[email protected]>
>> wrote:
>>
>>> Have you considered using fcd-output?
>>> The simplest (though not the most efficient) way to retrieve data from
>>> all vehicles is by looping over the list of all ids:
>>>
>>> for vehID in traci.vehicle.getIDList():
>>> traci.vehicle.getPosition(vehID)
>>>
>>> Am Di., 1. März 2022 um 14:59 Uhr schrieb amir kr <[email protected]
>>> >:
>>>
>>>> Hello everyone,
>>>> I want to get the position of all vehicles in each step time but when I
>>>> want to use traci.vehicle.getPosition(VehID) I do not know what to put
>>>> instead of VehID because I want to get the position of all vehicles. how
>>>> can I fix it ?
>>>> best regards,
>>>> Amir,
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