[ROOT] TGraph functions?

From: Gregory Novak (Gregory.Novak@cern.ch)
Date: Thu Mar 01 2001 - 00:59:16 MET 

I want to do a fit to a function and then pluck the function from the
TGraph object.  I have the following macro, which shows that "func"
doesn't point to anything.

I managed to get a hold of the object through GetListOfFunctions, and
found that the function does in fact think it's name is "pol2".  So what's
wrong with this code?

{
  Float_t x[] = {1,2,3};
  Float_t y[] = {1,4,9};
  TGraph *tg=new TGraph(3,x,y);
  tg->Fit("pol2");
  tg->Draw("AL*");
  TF1 *func;
  func=tg->GetFunction("pol2");
  cout << func << endl;
}

Thanks,
Greg

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