Functional Form of a Histograme

ROOT
#1

Dear ROOT Users

I am trying to get the functional form of a Germanium pulse from TH1::GetFuntion() method
in ROOT but some how it is not working and giving the error

TFile *f = new TFile(filename);
  TH1 *hI = (TH1*)f->Get("gated_Tr_1_1");
   TF1 *f1 = (TF1*)hI->GetFunction("func");
  cout<<f1<<endl;
  f1->Draw();  // this line giving error

It says
0
Error: illegal pointer to class object f1 0x0 2344  current.C:33:

can anyone please help me what should be done ???

#2

Where do you expect this “func” to be coming from? How did it get associated to your histogram?
Maybe search for all occurrences of “associated function” in http://root.cern.ch/root/html/TH1.html

#3

Thanks

The problem has been resolved.

Actually I just came to know that TH1::GetFunction() can be called after applying fitting.

Now I have used TSpline3 class for interpolation of the values and it is working well.

Thanks for your time.