Re: about selecting bins in THnSparse

Hi Axel,

2011/3/30 Axel Naumann <Axel.Naumann_at_cern.ch>

> Hi,
>
> Apologies for the slow reply - I was away from work and internet for a
> while.
>
> You could select the first range, do the projection, then select the second
> range, do the projection to a different histogram, and then add the two
> projection histograms. Would that do what you are looking for?
>
>

Thanks for the answer! But it does not fit inot my situation because what I actually have is something like 10 patches of discrete ranges, each with considerable staticstics. So projection-merge for every range is not that economical...

Is there a functionality like disabling some status bits of the axis bins so that the disabled bins won't participate in the projection?

Cheers,
Xianguo

> Cheers, Axel.
>
> ________________________________________
> From: owner-roottalk_at_root.cern.ch [owner-roottalk_at_root.cern.ch] on behalf
> of Xianguo Lu [lu.xianguo_at_gmail.com]
> Sent: 26 March 2011 15:12
> To: roottalk_at_root.cern.ch
> Subject: [ROOT] about selecting bins in THnSparse
>
> Hi Rooters,
>
> I have a question about selecting bins in THnSparse. It is the following.
>
> If I want to select only a certain range of a axis and do the projection of
> the
> THnSparse, then I do
> thnsparse->GetAxis(axisX)->SetRange(bin0, bin1);
> hh=(TH1D*)thnsparse->Projection(axisY);
>
> But what if I want to selection discontinuous patches of bins, like e.g.
> [bin0-bin1]+[bin4, bin5],
> then is there a simple way to do the projection?
>
> Many thanks!
>
> best regards,
> Xianguo
>
>
> --
> Xianguo Lu
>
> Physikalisches Institut
> Raum 204 OG2
> Philosophenweg 12
> D-69120 Heidelberg
>
> Tel: +49-6221-549499
>

-- 
Xianguo Lu

Physikalisches Institut
Raum 204 OG2
Philosophenweg 12
D-69120 Heidelberg

Tel:  +49-6221-549499