<HTML> <HEAD> <TITLE>Re: [Gate-users] Random Numbers</TITLE> </HEAD> <BODY> Hi Sane, If you change the energy window you are going to select different events, which alters the execution path of your simulation and ultimately will yield different results.  Remember that random numbers are used throughout GATE and GEANT from particle emission (energy, position, direction), to blurring etc.  You could use digigate for your needs. Richard On 2/13/08 7:41 AM, "Sanae Rechka" <Sanae.Rechka@USherbrooke.ca> wrote: <BLOCKQUOTE><TT> Dear Gate Users, I have noticed some thing important : I used the command /gate/output/root/setSaveRndmFlag 0 (0 instead of 1) to maintain the same random numbers for my simulations. And I changed just the energy resolution from a simulation to an other, when I compared the gateHits.dat files, also gateSingles.dat files, the events IDS at the beginning of the files are the same, but at the end of files they are not similar, the random number changed and I didn't get the same events ....  ???? Can you help me please understand what is happening ? Looking forward to your answer Thank you very much Sanae _______________________________________________ Gate-users mailing list Gate-users@lists.healthgrid.org <a href="http://lists.healthgrid.org/mailman/listinfo/gate-users">http://lists.healthgrid.org/mailman/listinfo/gate-users</a> </TT></BLOCKQUOTE><TT> </TT> -- Richard Taschereau, Ph.D. CRUMP Institute for Molecular Imaging University of California Los Angeles 700 Westwood Plaza A222 Los Angeles, CA 90095-1770 Phone: (310) 825-0697 Fax:     (310) 206-8975 email: RTaschereau@mednet.ucla.edu ---------------------------------------------------------- IMPORTANT WARNING: This email (and any attachments) is only intended for the use of the person or entity to which it is addressed, and may contain information that is privileged and confidential. You, the recipient, are obligated to maintain it in a safe, secure and confidential manner. Unauthorized redisclosure or failure to maintain confidentiality may subject you to federal and state penalties. If you are not the recipient, please immediately notify us by return email, and delete this message from your computer. ---------------------------------------------------------- </BODY> </HTML>