[gate-users] Re: How to make uncorrelated random number seeds?

[Mutanga Theodore]

Thanks Anath,
I can hardly take credit for that , thank the GATE forum, but good to know
its working for you tho.
Cheers
theo
>
> Thanks for you assistance, your method seems to be working like a
> charm.  I am now running my four simulations in tandem, and the first
> thousand events are completely unique.
>
> Thanks,
> Ananth
>
>>I have read all of your previous discussions on controlling the random
>>number seed to ensure that
>>each run is independant and have tried to follow these instructions to
>> only
>>have my system perform
>>four identical runs.
>>
>>I am running 4 parallel simulations each at different time intervals of
>> GATE
>>on my dual processor machine.  I have dedicated a separate folder to each
>>simulation within which i have placed beginOfRun.rndm,  endOFRun.rndm,
>> the
>>macro file, and the GATE executable.
>>
>>In each copy of my macro file I have the following code:
>>
>>/gate/output/root/enable
>>/gate/output/rootsetSaveRndmFlag 1
>>/random/setSavingFlag 1
>>
>>In my output, I find the exact same event numbers in each of the four
>> hits
>>files, the only difference is the time of each event, which are just
>> offset
>>by the starting point of the interval for that run.
>>
>>This is disconcerting, since I have run several simulations only to
>> recently
>>discover that none of them are really admissable.
>>
>>You help is always appreciated.
>>
>>Ananth Ravi
>>
>>
>>
>>
>>Message: 2
>>Date: Fri, 17 Dec 2004 18:08:11 +0100 (MET)
>>From: "Mutanga Theodore" <muathe02 at student.umu.se>
>>Subject: Re: [gate-users] How to make uncorrelated random number
>>	seeds?
>>To: "GATE feedback and helpline for Users"
>>	<gate-users at lphe1pet1.epfl.ch>
>>Message-ID: <40016.81.172.169.69.1103303291.squirrel at 81.172.169.69>
>>Content-Type: text/plain;charset=iso-8859-1
>>
>>Hello There,
>>
>>Please refer to some of the posts I made earlier. I solved this by making
>>a mock simulation with a very weak source like 10Bq or even less. Then I
>>made a script that runs this simulation say 100 times (four times in your
>>case), in each instance, I get the file endOfrun.rndm , rename it to
>>status00i.rndm where i goes from 1 - 100 or whatever number of randoms
>> you
>>want to generate. ( in your case four maybe)
>>Then use this status00i.rndm files and force your simulations to use them
>>by using the comand /random/resetEngineFrom .
>>
>>Atleast with this method you have different seeds to begin your
>>simulations with, however if they are uncorrleted or not is another
>> issue,
>>I made a post about using this method but no one commented about it so Im
>>using it for now and Im getting some results
>>
>>hope this helps
>>
>>Cheers
>>
>>Theo
>>
>>
>>
>>
>
>
> _______________________________________________
> gate-users mailing list
> gate-users at lphe1pet1.epfl.ch
> http://lphe1pet1.epfl.ch/mailman/listinfo/gate-users
>