Same seed in all the multi-simulations ?

[Benoit Gaudou]

Dear all,

Given an answer made by Patrick recently, I noticed that in the multi-simulation, all the created simulations share the same value of the seed.

See below: 

model NewModel1

global {

init {

write " " + self + " - " + seed ;

}

}

experiment NewModel1 type: gui {

init {

create simulation number: 2 ;

}

}

The result is:

 NewModel1_model(0) - 0.6448361682289907

 NewModel1_model(0) - 0.6448361682289907

 NewModel1_model(1) - 0.6448361682289907

In my mind, the simulations would have different seed values, but perhaps I am wrong ?

Is it the expected behavior ?

Cheers

Benoit

[Huynh Quang Nghi 002628]

Very strange for me, totally lost

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[Huynh Quang Nghi 002628]

Regard this https://gama-platform.github.io/wiki/RunSeveralSimulations.html#random-seed

"If you run several simulations, you may want to use the same seed for each one of those simulations (to compare the influence of a certain parameter, in exactly the same conditions)." It seems normal experiment will create same-seed-simulations

[Benoit Gaudou]

Hi,

This line does not really support the fact that the seeds are the same.

But the picture on the page does it.

So nothing new (but I had another intuition...)

Thanks 

Benoit

[Huynh Quang Nghi 002628]

Yes, for that line, i forgot to mention that in batch mode, each sim will have different seed.