Hi Mat, TH1::GetMaxBin returns the bin number with the maximum bin content. TH1::GetMinBin returns the bin number with the minim bin content. In case of 2 or more bins having the max/min value, the first bin is taken. Rene Brun On Sat, 19 May 2001, Matthew Martin wrote: > Seems to give an answer twice as small as how big the thing actually is: > > TH1F *hist_bp_PtResidWeight = new TH1F("hist_bp_PtResidWeight","bp pt > weighted residual",40,-4.0,4.0); > > > > then I fill the thing. > > Then: > > TH1F histTest(*hist_bp_PtResidWeight); > > > cout<<"Max bin: "<<histTest.GetMaximumBin()<<"Min bin: > "<<histTest.GetMinimumBin()<<" 1st bin centre: > "<<histTest.GetBinCenter(1)<<endl; > > > > > > This gives: > > Max bin: 20Min bin: 1 1st bin centre: -3.9 > > > > > Max bin should be 40 non? > > cheers > > Mat >
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