[Rivet] query on rivet-analysis

[Mukesh Kumar]

Thanks Andy, really useful suggestions.


*Mukesh Kumar*






*School of Physics & MITP University of the Witwatersrand Private Bag 3
Wits 2050 South AfricaMob. No. +27 829 624 780*

*emails: mukesh.kumar at cern.ch <mukesh.kumar at cern.ch>*

*            mukesh.kumar at wits.ac.za <mukesh.kumar at wits.ac.za>*

On Sun, Nov 29, 2015 at 7:57 PM, Andy Buckley <andy.buckley at cern.ch> wrote:

> Hi Mukesh,
>
> Rivet doesn't have any *built-in* support for ntupling -- it's primarily
> designed as an events-to-plots system for MC validation, tuning and
> prototyping.
>
> The file format is not the only reason that the files would be much bigger
> -- although YODA's text format is not primarily designed for space
> efficiency. In the mode that you want, the output files grow with the
> number of input events, while histograms have a fixed size determined by
> the numbers of bins. You can of course already make cut flow histograms
> etc. within the event loop, but you won't have access to event-by-event
> correlations and other things that are useful for cut optimisation.
>
> But if you want you can create a ROOT TTree and TFile in the init() method
> and then fill entries into the tree with each event: that is pretty easy to
> do, and will result in an output ROOT file like you want... but there
> aren't any built-in tools to help you do it.
>
> Andy
>
>
> On 29/11/15 12:43, Mukesh Kumar wrote:
>
>> Hi Andy,
>>
>> Thanks  for the answer, and in fact you answered by saying "ntuple" is
>> much larger file but is there any possibility
>> to save that in lighter version may be in root files so that one could
>> do analysis for rates, cut-flows etc?
>>
>> *Mukesh Kumar
>> **School of Physics & MITP
>> University of the Witwatersrand
>> Private Bag 3
>> Wits 2050
>> South Africa
>> Mob. No. +27 829 624 780
>>
>> *
>> *emails: mukesh.kumar at cern.ch <mailto:mukesh.kumar at cern.ch>
>> *
>> *mukesh.kumar at wits.ac.za <mailto:mukesh.kumar at wits.ac.za>
>> *
>>
>> On Thu, Nov 26, 2015 at 10:11 AM, Andy Buckley <andy.buckley at cern.ch
>> <mailto:andy.buckley at cern.ch>> wrote:
>>
>>     On 25/11/15 18:34, Mukesh Kumar wrote:
>>
>>         Hi Andy,
>>
>>         I have a simple query on rivet-analysis:
>>         After piping with HepMC files we get .yoda files following the
>>         analysis
>>         routine where we filled
>>         all the histograms and as a result get the needed plots.
>>         But is it possible somehow to use those .yoda files for the
>>         purpose of
>>         statistical analysis,
>>         I mean further if I just want to look for significance after
>>         some cut
>>         choices etc. In this way
>>         always we don't need to run the codes again and again which
>>         really takes
>>         longer.
>>
>>         Hope you understand what I meant to ask.
>>
>>
>>     Hi Mukesh,
>>
>>     I'm not sure I do fully understand -- the .yoda file contains
>>     histograms, i.e. the "per event" observables and their correlations
>>     have been lost. Otherwise it would be an ntuple file and would be
>>     *much* larger.
>>
>>     You can of course make transformations on the histograms, i.e.
>>     rescale, divide, integrate, ... but I think that's not what you're
>>     asking for?
>>
>>     Andy
>>
>>     --
>>     Dr Andy Buckley, Lecturer / Royal Society University Research Fellow
>>     Particle Physics Expt Group, University of Glasgow
>>
>>
>>
>
> --
> Dr Andy Buckley, Lecturer / Royal Society University Research Fellow
> Particle Physics Expt Group, University of Glasgow
>
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