[ROOT] Fit

From: Sam Abraham (abraham@mail.desy.de)
Date: Fri Feb 02 2001 - 11:29:42 MET 

Hi. I have got the following program and i would like to apply a fit. But
if i use the fit panel it doesn't accept my command. It says that (for
example)" Function pol1 is not 2-D". How can I fit my graph.Which
statement can I use?

Here is my program.

{
gROOT->Reset();
ifstream in;
in.open("data01.dat",ios::in);
Float_t x0,x1;    
Float_t bins=4096,lower=-0.5,upper=4095.5;
//      TFile *f=new TFile("2root.dat","RECREATE");
TH1F *h0=new TH1F("h0","1",bins,lower,upper);
//      TH1F *h1=new TH1F("h1","",bins,lower,upper);
//      h0->SetMaximum(30);

TNtuple *my_ntup = new TNtuple("name","title","x:y");

int lines = 0;

while(1)
{
  if(!in.good())break;
  if(x0<4095&&x0>480&&x1<4095&&x1>480)
  my_ntup->Fill(x0,x1);
  lines++;
}
cout << lines << "lines were read from file " << endl;

in.close();


my_ntup->Draw("y:x");

}


Cheers for help, Sam.

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