RE: geting the values stored in the histograms.

From: Fine, Valeri <fine_at_bnl.gov>
Date: Sun, 2 Jul 2006 21:09:02 -0400

There are two ways:

1. Each concrete histogram class is derived from TArray class http://root.cern.ch/root/htmldoc/TH1F.html This means one can treat each histogram object as a plain array of "float" number and use it as such. (For example method "[int]} returns what you want)

       TH1F *histogram = new TH1F( some parameters);
       TH1F &bins = *histogram;
       for (int i=0; i< 100; i++) 
             printf(" Bin %i contains the value %f\n", i, bins[i]); 

  2. One can use the methods like TH1::GetBin<XXX>
      , where XXX  could be "Center", "Content", "Error" etc
     see doc please
     http://root.cern.ch/root/htmldoc/TH1.html#TH1:GetBinContent 

Hope this helps.

---

Best regards

                   Valeri

> -----Original Message-----
> From: owner-roottalk_at_pcroot.cern.ch

[mailto:owner-roottalk_at_pcroot.cern.ch] On
> Behalf Of nasim
> Sent: Sunday, July 02, 2006 7:43 PM
> To: roottalk_at_pcroot.cern.ch
> Subject: [ROOT] geting the values stored in the histograms.
>
>
> Hi,
> If we have one dimensional histogram with 100 entries.
> Is it possible to extract the value of its x axis for each entry?
>
> Any help would be appreciated,
>
> Nasim
>
>
> --
Received on Mon Jul 03 2006 - 03:09:18 MEST