[Rivet] adding histograms

[Robert King]

Hi Frank,

Yes that's what I'm after. Would you be willing to share it?

Robert

On 18 March 2011 10:49, Frank Siegert <frank.siegert at cern.ch> wrote:

> Hi Robert,
>
> I have a script which takes multiple .aida files and merges (averages) them
> into one. This is a good enough approximation if your aida files contain
> roughly the same number of events. Is that what you are after?
>
> Cheers,
> Frank
>
>
> On 18/03/11 09:19, Robert King wrote:
>
>> Ok, Thanks for letting me know Andy. I'll just write a pyroot script to
>> do it myself then...
>>
>> On 17 March 2011 23:13, Andy Buckley <andy.buckley at ed.ac.uk
>> <mailto:andy.buckley at ed.ac.uk>> wrote:
>>
>>    On 17/03/11 08:40, Robert King wrote:
>>     > Hi Rivet Experts,
>>     >
>>     > I expect this is a simple question, but I couldn't see how to do
>>    it. I
>>     > want to generate a large MC sample and create histograms using
>> Rivet.
>>     > I do this by splitting the job up into 100 sub jobs. I then want to
>>     > add the histograms that are made for each subjob into one
>>    histogram. I
>>     > suppose I could convert the .adia files to root files and add
>>    together
>>     > in root but I hoped there might be a method in Rivet already for
>>    doing
>>     > this...
>>
>>    Hi Robert,
>>
>>    Unfortunately this can't be done "properly" at the moment, because the
>>    output histograms are just x, y, and error values rather than
>> containing
>>    the sort of weighted moments information that's needed to do a proper
>>    statistical combination. If you convert them to ROOT you'll get
>> TGraphs,
>>    which are the same sort of deal, or TH1Fs in which case the combination
>>    is going to be a bit dodgy.
>>
>>    This has been a bit of a thorn in our side for a while, but it was more
>>    important to keep developing the physics content than to rewrite the
>>    histogramming. That's changing with our next release: we're taking a
>>    couple of months to migrate all the histogramming to a new system which
>>    will support all these good things. But for now it's approximations,
>> I'm
>>    afraid: sorry!
>>
>>    Andy
>>
>>    --
>>    Dr Andy Buckley
>>    SUPA Advanced Research Fellow
>>    Particle Physics Experiment Group, University of Edinburgh
>>
>>    The University of Edinburgh is a charitable body, registered in
>>    Scotland, with registration number SC005336.
>>
>>
>>
>>
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