[Rivet] adding histograms

[Robert King]

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> 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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