[Gate-users] "/gate/random/setEngineSeed auto" always generates the same results

[Uwe Pietrzyk]

Hi Franck,

I could reproduce your results, but also found a kind of temporary
solution:
It seems to be related to the "imageCT" option, since when I
disable this option by issuing : " /gate/output/imageCT/disable"
and only use the "/gate/random/setEngineSeed auto"
the files are different!
I am sure, that you can get the same information of imageCT by
writing the data out of a root-programm, although I haven't done so yet
by myself.

Hope this helps.

Kind regards,

Uwe
-----
On 19.08.2010, at 00:47, Franck P. Vidal wrote:

Hi there,

I set the random number generator as follows:
   /gate/random/setEngineName MersenneTwister
   /gate/random/setEngineSeed auto
   /gate/random/verbose 1

Every time I run my simulation, the output is always identical (e.g.
when I enable the ASCII output in "example_CT/fast"
benchmarkFastCTHits.dat, or the raw data benchmarkFastCT_000.dat),
whereas the initial seeds are different.

Even with   /gate/random/setEngineSeed   567489   I get the same output.

Is there any reason for that?
I was expecting the results to be different.

Best Regards,

Franck

--
Dr Franck P. Vidal
Postdoctoral Research Fellow

Department of Radiation Oncology
University of California, San Diego
Moores Cancer Center, Rm 1410
3855 Health Sciences Dr. #0843
La Jolla, CA 92093-0843
Tel: (858)822-7499
Fax: (858)822-6078
Homepage: http://pagesperso-orange.fr/f-p.v/

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