[Rivet] root usage in rivet

[Lars Sonnenschein]

Hello Altan
the aida2root converter is working in the same way as the aida2flat 
converter. When you execute the command:
aida2root bla.aida 
it produces the bla.root file which contains the TGraphs as Andy pointed 
out. You have to be sure, to have set up several things: 

D0 the following additional setup steps:
 setup setenv PYTHONDIR /usr
 setenv PATH $ROOTSYS/bin:$PYTHONDIR/bin:$PATH
 setenv LD_LIBRARY_PATH $ROOTSYS/lib:$PYTHONDIR/lib/python2.3:$LD_LIBRARY_PATH
 setenv PYTHONPATH $ROOTSYS/lib:$PYTHONDIR/lib/python2.3

you need also an update enough python version.

This conversion pythjon script is rather intended, to convert the data 
aida files which come with Rivet.
For simulated analyses you can simply specify the 
rivetgun --histotype ROOT 
option

	Lars


On Wed, 3 Sep 2008, Andy Buckley wrote:

> Altan Cakir wrote:
> > Hi Andy,
> > 
> > i need to asked one more question related to usage ROOT histograms via
> > Rivet framework. Actually it is not clear wiki page how to do it .
> > Therefore, i need a little bit clearfy in my mind. For example, in order
> > to generate events with Sherpa , shoudl i use sherpa data card(s) or
> > some another declaration.
> 
> That depends on your needs. If you have a static Sherpa configuration
> that you wish to use, then either using Sherpa's native conf files, or a
> rivetgun param file is probably best. If you're doing parameter scans,
> then you can use the rivetgun "-p <key>=<val>" arguments to override
> particular parameters without having to write anything to file.
> 
> > IN addition to that , I saw one script in
> > order to convert Aida file to Root file but it is not clear. I think the
> > best way how can i add my root program in AFS to rivet.
> 
> I've never used it, but Lars may be able to help. Note that Rivet
> currently writes all histograms out as the same AIDA "DataPointSet"
> type, since most reference histograms are either normalised or profile
> histos, hence the aida2root converter (or the ROOT output format from
> rivetgun) will only produce TGraph objects with no data about the events
> used to fill them. This isn't ideal, and the next version of Rivet will
> use a much richer histogramming interface and format.
> 
> If you want to use ROOT tuples from inside a Rivet routine, then the
> ExampleTree analysis may be a useful template. Such routines aren't very
> useful for increasing the analyses in Rivet, though, so we don't make
> encourage such an approach. Are you wanting to get ROOT plots from
> existing Rivet analyses or to write a new analysis?
> 
> > If i am able to
> > succeed properly in all case , i can prepare one basic wiki page to
> > clearify the people like me :)
> 
> That would be very helpful!
> 
> Best wishes,
> Andy
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> 

-- 

 
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Lars Sonnenschein    
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