[quote=“hegner”]In this example you would see how you could do it:
root.cern.ch/root/html/tutorial … t2d.C.html
If this doesn’t work for you, maybe show the code you try to use.[/quote]
I have attached the ROOT file contains a TProfile histogram. And I have posted how I used the commands. Even with FitPanel it doesn’t work. But the same when I convert to TH1* then fitting works.
MacBook-Air:Downloads hari$ r temp.root
root [0]
Attaching file temp.root as _file0...
root [1] .ls
TFile** temp.root
TFile* temp.root
KEY: TProfile alld_ift;1 alld_ift
root [2] alld_ift->Draw()
Info in <TCanvas::MakeDefCanvas>: created default TCanvas with name c1
root [3] alld_ift->Fit("pol1")
Warning in <Fit>: Fit data is empty
(class TFitResultPtr)140617827378464
root [4]
temp.root (25.8 KB)