Hi Norbert, Your version of Root/CINT does not allow a member function call as an argument of a function call. This limitation has been removed in the latest development version of CINT. In your case do Int_t binmin = hRFvsPsi->GetYaxis()->FindBin(min) hRFvsPsi->ProjectionX("hRegion2",binmin,..) Rene Brun Norbert Danneberg wrote: > > Hi , > > I do not understand why CINT does not know TH1D* hRegion2 in the example > below. > Drawing the histograms wors fine. > > root [0] hRFvsPsi = new TH2F("hRFvsPsi","RF versus > Psi",70,230,920,60,0,360); > root [1] Events.Draw("Psi:RF>>hRFvsPsi","MultCluster ==2 && > abs(Theta34Energy-$ > Warning in <MakeDefCanvas>: creating a default canvas with name c1 > root [2] Float_t min; > root [3] Float_t max; > root [4] min = 50; > root [5] max = 70; > root [6] > hRFvsPsi->ProjectionX("hRegion1",hRFvsPsi->GetYaxis()->FindBin(min), $ > root [7] hRFvsPsi->ProjectionX("hRegion2", > hRFvsPsi->GetYaxis()->FindBin(min+1$ > root [8] hRegion1->Draw(); > root [9] hRegion2->Draw(); > root [10] hRegion1->Add(hRegion2,1.0); > Error: No symbol hRegion2 in current scope FILE:/tmp/23121maa_cint > LINE:1 > *** Interpreter error recovered *** > root [11] hRegion2 > (class TH1D*)0x961b628 > > Createing the the objects within CINT works fine. > > root [15] TH1F* h2 = new TH1F("h2","h2",3,1,3) > root [16] TH1F* h1 = new TH1F("h1","h1",3,1,3) > root [17] h2->Fill(2) > (Int_t)2 > root [18] h1->Fill(1) > (Int_t)1 > root [19] h1->Add(h2,1.0) > > Cheers, > > Norbert
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