TH1 fit parameters

ROOT
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#1

I have a TH1F h1 which I fit using a Landau:

h1->Fit("landau","W","",20,60);

I would like to be able to get the MPV and Sigma of the fit. Is there a way of doing it without creating a TF1 and passing parameters to it?

#2

Before or after fitting:
TF1 *f = (TF1*)gROOT->GetFunction("landau"); f->Print("V");

After fitting:
TF1 *f = h1->GetFunction("landau"); f->Print("V");

1 Like
#3

This plus:

double MPV = f->GetParameter("MPV");
double Sigma = f->GetParameter("Sigma");

Gave me exactly what I wanted. Thank you!

#4

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