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Re: [sumo-user] Different probability flows between simulations
Dear Andras and Lokesh,

Thanks for your reply! Unfortunately, even with seed and random my simulation is generating the same flow in different simulation runs. I tested this in v1_7_0 tag and in master branch with all current changes. Is this working for you? If so, it's probably a problem in my build...

thanks in advance!

Em qua., 21 de out. de 2020 às 13:56, Lokesh Das <lokeshcsedu@xxxxxxxxx> escreveu:
Hi Tiago,

From the heading, it seems that you want to change the vehicle injection probability in every simulation run. If it is, you can do it in two ways: i) manually- every time change probability value in route file or ii) dynamically- change it using TraCI API. However, if you want with the same probability every simulation should have given you a different flow, just change the default seed value (23423; see https://sumo.dlr.de/docs/Simulation/Randomness.html). You can do it using <random value = "true" /> in *.sumocfg file. It simply uses the system current time as a seed value. 

Thanks,
Lokesh

On Wed, Oct 21, 2020 at 8:15 AM Tiago Silva <tiago.silva1230@xxxxxxxxx> wrote:
hello, 

I'm generating a flow of vehicles with probability='0.3' as seen in the code below:

 <flow id='flow_2' color="0,0,1" begin='0' end='4500' probability='0.3' type='vehicleType_1'>
          <route edges='5to1 1to3'/>
</flow>

It works correctly and generates the random flows I need during the simulation. However, I noticed that if I execute the simulation again it will generate the same random flow as the previous execution. Can you tell me if this is the expected behavior of random flow? I need to generate different flows in each simulation execution. Is there any way to do this?

Thanks in advance!

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Tiago Alves Silva

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