[ns] How to change seed in NS2

[Ilyes Gouta]

Hi,

You can modify the source code of RandomVariable/Uniform (the C++
part) in order to create a new binding that you would call to
reinitialize the seed or to call srandom(time()) to set a new seed.

Regards,
Ilyes Gouta.

On 4/26/06, Ghirmay Desta <ghirmish at yahoo.com> wrote:
>
> Hi maline nadine,
>
> I have had same problem too. I solved it this way. For
> every iteration, I seeded the defaultRNG with the
> random number generated in previous iteration. I hope
> this will help. Here is the implementation.
>
> #for generating random integer b/n min and max
>  set nextseed 0.0
>  proc randomNumber { min max } {
>       global nextseed
>       global defaultRNG
>       $defaultRNG seed $nextseed
>       set nRNG [new RNG]
>       $nRNG next-substream
>       set num_ [new RandomVariable/Uniform]
>       $num_ set min_ $min
>       $num_ set max_ $max
>       $num_ use-rng $nRNG
>       set nextseed [expr round([$num_ value])]
>       return $nextseed
>  }
>
>
> malin nadine <sidilala25000 at yahoo.fr> wrote:
>
> Hello every one
>
> I have used these commands to change the seed in
> ns-2:
>
> set val(seed) 0.0
>
>
> but when I run the same simulation many times, I got
> the same
> sesults.
>
>
> is there any help
>
> Thanks in advence
>
> Nadine
>
>
>
>
>
>
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