Fitting to set of data points

From: Eddy Offermann (eddy@rentec.com)
Date: Thu Dec 02 1999 - 03:43:59 MET 

Try using TGraph, something like

{
   gROOT->Reset();

   Float_t x[3], y[3];
   x[0] = 1.0;
   y[0] = 2.0;
   x[1] = 3.0;
   y[1] = 0.1;
   x[2] = 6.0;
   y[2] = 5.0;

   gr = new TGraph(3,x,y);
   gr->SetFillColor(19);
   gr->SetLineColor(2);
   gr->SetLineWidth(4);
   gr->SetMarkerColor(4);
   gr->SetMarkerStyle(21);
   gr->SetTitle("a simple graph");
   gr->Draw("ACP");

   TF1 *f1 = new TF1("f1","pol2");
   gr->Fit("f1","V");
   c1->Update();
}

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