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Hi Mike, What you need to store is "random number engine status". To store it: G4String fileN =3D "currentEvent.rndm";=20 HepRandom::saveEngineStatus(fileN); To retrive it: HepRandom::restoreEngineStatus(fileN); Makoto > -----Original Message----- > From: Michael H. Kelsey [mailto:email@example.com] > Sent: Wednesday, February 24, 2010 4:41 PM > To: eventtrackmanage-g4hn > Subject: Yet another random-seed question -- reproducing event #N >=20 >=20 > *** Discussion title: Event and Track Management >=20 > I have a standalone executable that drives its own event loop, directly > calling <process>->PostStepDoIt() to exercise a particular chunk of > GEANT4 code. In my development work, I've caused an abort() at event > #632 (loop=3D=3D631) in this test job. I would really like to try to > reproduce exactly that event (i.e., starting from the same random seed) > with the production version of GEANT4.9.3. >=20 > I have tried doing "CLHEP::HepRandom::getTheSeed()" inside the event > loop, but it reports exactly the same value on each event. Consequently, > I don't have any way to restart at a particular arbitrary event in the > job. >=20 > Is there a way to query the active random engine for the _current_ seed? > And then to feed in that seed on another job to reproduce the particular > event of interest to me? >=20 > Neither the ToolKit nor Application book seems to cover this issue. >=20 > -- Michael Kelsey >=20 > ------------------------------------------------------------- > Visit this GEANT4 at hypernews.slac.stanford.edu message (to reply or > unsubscribe) at: > http://hypernews.slac.stanford.edu/HyperNews/geant4/get/eventtrackmanage /915.h > tml
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