Hi Jennifer, I do not see any problem with TPythia6::SetMDCY. Did you initialize the class? Could you send a short example showing the problem? Rene Brun Jennifer Klay wrote: > > Hi, > I am using the TPythia6 libraries with ROOT to do some simulations on a > linux machine running Redhat linux. I have tried running in several > different versions of ROOT: 3.02.07, 3.03.09, 3.05.04. > > Using the $ROOTSYS/tutorials/pythiaExample.C, I tried to set the > parameter that turns OFF neutral pion decay: > > pythia->SetMDCY(111,1,0); > > Setting or unsetting this has no effect. Neutral pions are always > decayed (have status code 11). I checked the value of the parameter at > the end of the macro by using the Get method: > cout << pythia->GetMDCY(111,1) << endl; > > and it verifies that the value set is zero. > > When running PYTHIA as a standalone fortran program, this flag works, so > I suspect that the value is not being properly passed through the > wrapper code to the fortran implementation. > > Are there any workarounds to set this parameter and still use the ROOT > classes? I want to generate TTrees of the event record so I can run > some analysis after generating the events. > > Thanks, > Jennifer > > ============================== > Jennifer L. Klay > Lawrence Postdoctoral Fellow > Relativistic Nuclear Collisions Group > Nuclear Science Division > Lawrence Berkeley National Laboratory > ==============================
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