[Rivet] HepMC in human readable format

Hannes Jung hannes.jung at cern.ch
Fri Aug 10 12:10:27 BST 2012

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Hi Andy

thanks a lot.... yes, this is perfect.
I would very much support to have this available in the offical release...
this is just what I was looking for...

thanks a lot... this is great

Cheers
Hannes

On 10.08.2012, at 12:21, Andy Buckley wrote:

Hi Hannes,

You might find the output of the attached analysis also nice for event
visualisation purposes. I'll see if I can tidy this up to make it a
standard Rivet function in a future release.

Andy

On 10/08/12 06:08, Hannes Jung wrote:
Hi Andy

thanks for your mail, yes would be nice to have something like this.
Actually, I am pretty happy with what we got from the IO_AsciiiParticles,
in the routine, which I had attached.... (I attach it again)

Thanks aanyway for looking into it..
Cheers

Hannes

On 10.08.2012, at 00:11, Andy Buckley wrote:

Hi Hannes,

I may have been incredulous about the *expectation* that Rivet would
contain such a function, but I do see the usefulness of one. It won't be
high priority, but I'll look into providing a one-liner way to do it in
a future release. ATLAS has some fairly nice pretty-printing code that I
can probably "borrow" :-)

I did think that this would be as simple as

inline void printEvent(const GenEvent& evt) {
HepMC::IO_AsciiParticles ascii_io(std::cout);
ascii_io.write_event(&evt);
}

but unfortunately IO_AsciiParticles does not work the same way re.
stream constructors as does IO_GenEvent. If only HepMC were better...
but we're stuck with it now!

Cheers,
Andy

On 09/08/12 08:50, Hannes Jung wrote:
Hi Andy

to print to HepMC in a readable format is very essential
for people trying to learn what the MC is doing and to understand
how to do a selection for the analysis, also using Rivet just for
MC studies.

We have now several summerstudents, who use Rivet as an interface
to the MCs and to perform different studies. For this an understanding of
the event record is important.

Anyway, as I send yesterday in my mail, we have now managed to print
the HepMC record in a readable format in Rivet, so this is fine now.
Maybe it could be of help also for others to have this option available.

Cheers

Hannes

On 09.08.2012, at 09:26, Andy Buckley wrote:

Hi Hannes,

Why on earth would Rivet have a "print event like PYTHIA" function? The
access to the GenEvent object with all the structure is one function
call away from Rivet::Event -- is that really "complicated and
difficult"?!

We've tried to provide nicer ways than HepMC itself to access event
details -- iterating over particles, for example, is far easier than in
native HepMC. But our emphasis is on the histogrammed output more than
what's printed out to the terminal... and far more on the final state
and hadron relationships than the internal HepMC structure.

Other than the HepMC print and IO_AsciiParticles functions (and reading
the ASCII format), there are also a few graphical visualisation tools,
e.g. mcviz, that might be of interest.

Cheers,
Andy

On 07/08/12 21:27, Hannes Jung wrote:
Dear Andy et al

thanks a lot for your reply.

It's really fascinating, how complicated and difficult very trivial
things are in Rivet.
It must be a MUST, that one can print out the HEPMC record in a
readable format...
but it seems I can only get it via
event.genEvent().print()
but then the format is cryptic.

How do you people check, if selections etc are correct, if there is
no way to printout
what comes from the MC ?

It would be really very good if this could be provided.... I tried to
do it, but failed
due to my ignorance in the Rivet structure... so if anyone can help
there, I would
be really, really very happy....

I try to promote Rivet for our summer-students.... so.........

Thanks a lot

cheers
Hannes

On 07.08.2012, at 17:07, Andy Buckley wrote:

It's really a HepMC thing: Rivet doesn't include any special printout
formatting for GenEvents. The best I can think of offhand is, if you
have a Particle p, to use p.genParticle().print(). Any other HepMC
library function can also be used on the p.genEvent() reference.

Hope that helps,
Andy

On 07/08/12 15:18, Hannes Jung wrote:
Dear Rivet developers

I was wondering, whether there is an easy way to print out the HepMC
record in human readable format within Rivet, so that one can see
directly the event one is analyzing ?

Probably I have just not found the proper place, where this is
described... any hint would be great...

thanks a lot

cheers
Hannes

***********************************************************************
Hannes Jung
Email: Hannes.Jung at desy.de<mailto:Hannes.Jung at desy.de> <mailto:Hannes.Jung at desy.de>
<mailto:Hannes.Jung at desy.de>
mobile :+49 40 8998 93741
http://www.desy.de/~jung
Tel: +49 (0) 40 8998 3741
Fax: +49 (0) 40 8998 3093
DESY, CMS 01B/02.213
Notkestr.85, 22603 Hamburg, FRG
***********************************************************************

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--
Dr Andy Buckley, SUPA Advanced Research Fellow
Particle Physics Expt Group, University of Edinburgh

The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.

***********************************************************************
Hannes Jung
Email: Hannes.Jung at desy.de<mailto:Hannes.Jung at desy.de> <mailto:Hannes.Jung at desy.de>
mobile :+49 40 8998 93741
http://www.desy.de/~jung
Tel: +49 (0) 40 8998 3741
Fax: +49 (0) 40 8998 3093
DESY, CMS 01B/02.213
Notkestr.85, 22603 Hamburg, FRG
***********************************************************************

--
Dr Andy Buckley, SUPA Advanced Research Fellow
Particle Physics Expt Group, University of Edinburgh

The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.

***********************************************************************
Hannes Jung
Email: Hannes.Jung at desy.de<mailto:Hannes.Jung at desy.de> <mailto:Hannes.Jung at desy.de>
mobile :+49 40 8998 93741
http://www.desy.de/~jung
Tel: +49 (0) 40 8998 3741
Fax: +49 (0) 40 8998 3093
DESY, CMS 01B/02.213
Notkestr.85, 22603 Hamburg, FRG
***********************************************************************

--
Dr Andy Buckley, SUPA Advanced Research Fellow
Particle Physics Expt Group, University of Edinburgh

The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.

***********************************************************************
Hannes Jung
Email: Hannes.Jung at desy.de<mailto:Hannes.Jung at desy.de>
mobile :+49 40 8998 93741
http://www.desy.de/~jung
Tel: +49 (0) 40 8998 3741
Fax: +49 (0) 40 8998 3093
DESY, CMS 01B/02.213
Notkestr.85, 22603 Hamburg, FRG
***********************************************************************

--
Dr Andy Buckley, SUPA Advanced Research Fellow
Particle Physics Expt Group, University of Edinburgh

The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.

<PRINTHEPMC.cc>

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