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Forum: Documentation and Examples
Re: None error in running my modified exampleN03
Date: 22 Sep, 2002
From: Vladimir Ivanchenko <Vladimir Ivanchenko>

On Wed, 18 Sep 2002 stliu@mail.ustc.edu.cn wrote:

> *** Discussion title: Documentation and Examples
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/docsexamples/30"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
> I modified the exampleN03 to deal with Low energy gamma(140Kev)
> That was no problem in compiling the code.But some error happen
> when I run it.
>  When I execute "gdb ./exampleN03 run1.mac",there are no problem
> at the beginning,then the system show me this:
> 
> .
> .
> .
> Refreshing viewer "viewer-0 (OpenGLImmediateX)"...
> Traversing scene data...
> Viewer "viewer-0 (OpenGLImmediateX)" refreshed.
>   (You might also need "/vis/viewer/update".)
> /vis/viewer/update
> Viewer "viewer-0 (OpenGLImmediateX)" post-processing triggered.
> #
> # for drawing the tracks
> # (if too many tracks cause core dump => storeTrajectory 0)
> /tracking/storeTrajectory 1
> Idle> /run/beamOn 1
> /run/beamOn 1
> ### Run 0 start.
> /vis/scene/notifyHandlers
> Traversing scene data...
> Viewer "viewer-0 (OpenGLImmediateX)" of scene handler "scene-handler-0"
>   prepared at request of scene "scene-1".
> Start closing geometry.
> Start Run processing.
> 
> ---> Begin of event: 0
> 
> --------- Ranecu engine status ---------
>  Initial seed (index) = 0
>  Current couple of seeds = 9876, 54321
> ----------------------------------------
> <CalCollection> is not found.
> 
> Program received signal SIGSEGV, Segmentation fault. 0x8146912 in
> G4LowEnergyPhotoElectric::GetMeanFreePath ()
> 
> What is the problem? Thanks for your help.
> 
Hi,

First of all one should look into modification of the PhysicsList. I
propose to run the example with nonmodified PhysicsList first. If the bug
will still takes place - remove all changes which were introduced by you.
After you can return back your things one by one, after each modification
run the example. 

Note, that simple substitution standard -> lowenergy should not provide a
problem. 

VI

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