[ROOT] TGraph won't work!

From: Ahmet Sedat Ayan (ayan@cms.physics.uiowa.edu)
Date: Fri Aug 16 2002 - 21:05:32 MEST 

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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