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

[Ananth Ravi]

Hello All,

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


----- Original Message ----- 
From: <gate-users-request at lphe1pet1.epfl.ch>
To: <gate-users at lphe1pet1.epfl.ch>
Sent: Friday, December 17, 2004 6:00 AM
Subject: gate-users Digest, Vol 9, Issue 16


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>
> Today's Topics:
>
>    1. Re: ring diameter (Claude Comtat)
>    2. (pas de sujet) (Sebastien JAN)
>    3. Derenzo phantom (Jin Zhang)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 16 Dec 2004 13:40:36 +0100
> From: Claude Comtat <comtat at ieee.org>
> Subject: Re: [gate-users] ring diameter
> To: GATE feedback and helpline for Users
> <gate-users at lphe1pet1.epfl.ch>
> Message-ID: <41C18244.5040000 at ieee.org>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>
>
> Mutanga Theodore wrote:
>
> > I also found out that the axial sampling interval is 1/2*axial pitch ???
> > Am I right ?
>
>
> Yes
>
>
> Claude
>
>
> -- 
> Claude Comtat comtat at ieee.org
> Image acquisition and processing group tel: +33 1 69 86 77 02
> Frederic Joliot Hospital Facility fax: +33 1 69 86 77 49
> French Atomic Energy Commission www-dsv.cea.fr/shfj
>
>
>
> ------------------------------
>
> Message: 2
> Date: Thu, 16 Dec 2004 16:41:58 +0100
> From: Sebastien JAN <jan at shfj.cea.fr>
> Subject: [gate-users] (pas de sujet)
> To: GATE feedback and helpline for Users
> <gate-users at lphe1pet1.epfl.ch>
> Message-ID: <41C1ACC6.5010304 at shfj.cea.fr>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>
>  From Els Wieers :
> -----------------------
>
> Dear gaters,
>
> I'm trying to build the geometry of the ClearPET scanner of Brussels.
> Up to the building of the cassettes everything goes ok. These cassettes
> should be repeated along  a ring repeater and the second, the fourth,
> the sixth, ... copy should be shifted along the z-axis over a distance
> of 5 mm compared to the first, third, fifth, .. copy.
>
> So I used the following commands
>
> /gate/cassette/repeaters/insert ring
> /gate/cassette/ring/setRepeatNumber 20
> /gate/cassette/ring/setModuloNumber 2
> /gate/cassette/ring/setZshift1 -2.5 mm
> /gate/cassette/ring/setZshift2 +2.5 mm
>
> Unfortunately when I compile, I get the following messages:
> /gate/cassette/repeaters/insert ring
> /vis/scene/notifyHandlers scene-0
> /gate/cassette/ring/setRepeatNumber 20
> /vis/scene/notifyHandlers scene-0
> /gate/cassette/ring/setModuloNumber 2
> ***** COMMAND NOT FOUND </gate/cassette/ring/setModuloNumber 2> *****
> ***** Command ignored *****
> /gate/cassette/ring/setZshift1 -2.5 mm
> ***** COMMAND NOT FOUND </gate/cassette/ring/setZshift1 -2.5 mm> *****
> ***** Command ignored *****
> /gate/cassette/ring/setZshift2 +2.5 mm
> ***** COMMAND NOT FOUND </gate/cassette/ring/setZshift2 +2.5 mm> *****
> ***** Command ignored *****
>
> I do not understand since I used the exact commands as the one used in
> the usersguide page 32.
> Can somebody tell me if what is wrong? Is this function out of Gate? And
> if so, how can I get this shift?
>
> Greets
> Els
>
> ------------------------------
>
> Message: 3
> Date: Thu, 16 Dec 2004 17:35:32 -0800
> From: Jin Zhang <jinzhang at stanford.edu>
> Subject: [gate-users] Derenzo phantom
> To: GATE feedback and helpline for Users
> <gate-users at lphe1pet1.epfl.ch>
> Message-ID: <41C237E4.4030505 at stanford.edu>
> Content-Type: text/plain; charset=us-ascii; format=flowed
>
> Hi guys:
>
> Is there any better way to generate a Derenzo phantom with about 100
> sphere sources totally with different diameters? Or I have to create
> them one by one manully? It's easily got messed-up on the positions of
> the sources.
>
> Thanks a lot,
>
> Jin Zhang
>
>
> ------------------------------
>
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> End of gate-users Digest, Vol 9, Issue 16
> *****************************************
>