[Rivet] changeset 6250:8cb5b4e4d068

[Andy Buckley]

Hear hear. Multiweights first, though, since we need to get that thing finally released, and the code will strongly overlap between that and the re-entrant histo handling.

Holger, you were also interested in having the YODA histograms generalised to N dimensions, right? I think I have a workable plan for that*; but could do with development help! Again, MCnet shorties might be an option.
Andy
[*] This is one of the places where Haskell or similar seems like a perfectly suited language: it's very natural to treat N-dim lookups etc. as a one-dim-at-a-time reduction of an arbitrarily long coordinate or index vector. Not so elegant in C++, unfortunately!
Dr Andy Buckley, Lecturer / Royal Society University Research Fellow
Particle Physics Experiment Group, University of Glasgow

On Mar 8 2018, at 3:46 pm, Christian Gutschow <chris.g at cern.ch> wrote:
>
> Hi Holger,
>
> hm, I don’t think there is fail-proof heuristic that can distinguish between a simple ratio, an efficiency, a double ratio or something even more complicated. Best thing would be to get the re-entrant histogramming going, so you can just re-run the finalize on the merged intermediate histograms. :-)
>
> Cheers,
> Chris
>
> > On 8 Mar 2018, at 15:36, Holger Schulz <holger.schulz at durham.ac.uk (mailto:holger.schulz at durham.ac.uk)> wrote:
> > Hi Chris,
> > in that regard --- when merging scatters in general, is there a
> > mechanism to identify scatters that are "safe to merge"?
> > I.e. to identify whether you can just calculate the mean of points?
> >
> > Holger
> >
> > On 08/03/18 08:57, Christian Gutschow wrote:
> > > Hi,
> > >
> > > just to say that I’ve just committed a bug fix for ATLAS_2012_I1083318 (7 TeV W+jets).
> > > The Scatter2D containing the ratios of consecutive Njet bins was being filled suboptimally in the finalize and there was a potential for bins to be skipped in case of low statistics, which causes a problem when merging multiple yoda files.
> > > Cheers,
> > > Chris
> > >
> > >
> > >
> > > —
> > > Dr. Christian Gütschow
> > > Department of Physics and Astronomy
> > > University College London
> > > Gower Street
> > > London WC1E 6BT
> > >
> > >
> > >
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>
>
> —
>
> Dr. Christian Gütschow
>
> Department of Physics and Astronomy
> University College London
> Gower Street
> London WC1E 6BT
>
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