TPaveStats for TH2

From: Chiara Zampolli <Chiara.Zampolli_at_bo.infn.it>
Date: Fri, 07 Mar 2008 09:58:10 +0100

Hi all,

    could you please explain me the meaning of the 3 raws-3 columns table that appears when trying to get the underflow/overflow fields for a TH2? I know from the ROOT reference guide that (from http://root.cern.ch/root/html/TPaveStats.html):

NOTE that in case of 2-D histograms, when selecting just underflow (10000)

        or overflow (100000), the stats box will show all combinations
        of underflow/overflows and not just one single number!

but still I don't understand the numbers... And I don't even know how to access the overflows/underflows from the command line:

  cout << " underflow bin = " << h2->GetBin(0,0) << endl;
  cout << " underflows = " << h2->GetBinContent(0) << endl;
  cout << " overflows  = " << h2->GetBinContent(maxbin_X+1,maxbin_Y+1) 

<< endl;

all return 0.....

    Thanks for your help.
    Cheers,

          chiara Received on Fri Mar 07 2008 - 09:58:50 CET