Hello, I found a strange behaviour with the functions Fill, GetBinContent and SetBinContent. Using the following macro { gROOT.Reset(); UShort_t cnt[3]; cnt[0]= 1001; cnt[1]= 1002; cnt[2]= 1003; TH1S toto("t","Test",3,-0.1,2.9); TH1S toto1("t1","Test",3,-0.1,2.9); for (Int_t j=0;j<3;j++) { toto.SetBinContent(j,cnt[j]); printf("toto: channel %d content %d \n",j,toto.GetBinContent(j)); toto1.Fill(j,cnt[j]); printf("toto1: channel %d content %d \n",j,toto1.GetBinContent(j)); printf("toto1+: channel %d content %d \n",j,toto1.GetBinContent(j+1));} } I obtain: toto: channel 0 content 1001 toto1: channel 0 content 0 toto1+: channel 0 content 1001 toto: channel 1 content 1002 toto1: channel 1 content 1001 toto1+: channel 1 content 1002 toto: channel 2 content 1003 toto1: channel 2 content 1002 toto1+: channel 2 content 1003 Is the bin range running between 0,nbins-1 or 1,nbins? Why in this particular case Fill and SetBinContent does not give identical results? Many thanks in advance for the answer Best regards Laurent
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