Hi,
Simply replace:
Int_t dum[24]
by
Float_t dum[24]
The TGraph constructors accept all types, but not mixed types.
Rene Brun
On Fri, 16 Aug 2002, Ahmet Sedat Ayan wrote:
> Hi All,
> I am having a problem that I do not really understand.
> I am trying to plot an array (Int_t dum[24]) against the other
> (Float_t le_ped[24]) and getting the following error:
>
> ------------------
> Error: Can't call TGraph::TGraph(24,dum,le_ped) in current scope
> FILE:kings.C LINE:22
> Possible candidates are...
> filename line:size busy function type and name (in TGraph)
> (compiled) 0:0 0 public: TGraph TGraph(void);
> (compiled) 0:0 0 public: TGraph TGraph(Int_t n);
> (compiled) 0:0 0 public: TGraph TGraph(Int_t n,const Int_t*
> x,const Int_t* y);
> (compiled) 0:0 0 public: TGraph TGraph(Int_t n,const Float_t*
> x,const Float_t* y);
> (compiled) 0:0 0 public: TGraph TGraph(Int_t n,const Double_t*
> x,const Double_t* y);
> (compiled) 0:0 0 public: TGraph TGraph(const TVector& vx,const
> TVector& vy);
> (compiled) 0:0 0 public: TGraph TGraph(const TVectorD& vx,const
> TVectorD& vy);
> (compiled) 0:0 0 public: TGraph TGraph(const TH1* h);
> (compiled) 0:0 0 public: TGraph TGraph(TGraph&);
> filename line:size busy function type and name (in TNamed)
> filename line:size busy function type and name (in TObject)
> filename line:size busy function type and name (in TAttLine)
> filename line:size busy function type and name (in TAttFill)
> filename line:size busy function type and name (in TAttMarker)
> *** Interpreter error recovered ***
> -----------------------------------------------------
>
>
> And the code is :
>
> ----------------------------------
> {
> // reading file
> Float_t re_ped[24],rh_ped[24],le_ped[24],lh_ped[24];
> FILE *pedestalfile=fopen("ped410.dat","r");
> Int_t n=0; cout<<"Reading Pedestal Data"<<endl;
> while
> (fscanf(pedestalfile,"%f%f%f%f",&re_ped[n],&rh_ped[n],&le_ped[n],&lh_ped[n])
> )
> {
> n++; // counting number of entries for the graph
> if (n == 24) break;
> }
> fclose(pedestalfile);
> Int_t dum[24]
> ={1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24};
> for(Int_t i=0;i<24;i++){
> printf("%f,%f,%f,%f,%d\n",re_ped[i],rh_ped[i],le_ped[i],lh_ped[i],i);
> }
>
>
>
> TGraph *gr = new TGraph(24,dum,le_ped);
>
>
> gr->Draw("AP");
>
>
>
>
>
> }
> ------------------------------------------------------
>
> Could anyone help me understand what I am doing wrong here?
>
> thanks a lot,
> ahmet.
>
>
>
> ***************
>
> Ahmet Sedat Ayan
>
> Physics & Astronomy Dept.
> Van Allen Hall
> University of Iowa
> Iowa City, IA, 52242
>
> Voice : (++ 1 319) 335-1941 (W) (GMT-6)
> Occupation : Ph.D Candidate (But still dreamer!)
> e-mail : ayan@cms.physics.uiowa.edu
> web : http://jazz.physics.uiowa.edu/~ayan
>
>
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