Fitting vector of TGraphs result in "Warning in <Fit>: Fit data is empty"

[Piet]

Thanks a lot for your quick reply Pepe

I read first your suggestions here:

TProfile fitting

[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.…

and I tried with “W” and “WW” as well before mailing, but without success. Below is a summary for each option I tried:

[ul]
[li]“R” → “Warning in : Fit data is empty”[/li]
[li]“RW” → “Warning in : Fit data is empty”[/li]
[li]“RWW” → “Warning in : Fit data is empty”[/li]
[li]“RL” → “Info in : L (Log Likelihood fit) is an invalid option when fitting a graph. It is ignored Warning in : Fit data is empty”[/li]
[li]“W” → fitting is executed, but chi^2 is 10^11, p0 nearly 0 and p1 remained the initial value i gave it to start with, both with huge uncertainties. So i am not getting a meaningful fit here.[/li]
[li]“WW” → same result as with “W” option[/li][/ul]

Any idea what is going on?
Thanks a lot
greets
Piet