Dear experts,
I set parameters and fixed some of them to fit an histogram, then I want to change/unfixed some of the parameters and fit the same histogram, but I noticed that couldn’t change any more the fixed parameters. I wonder how I can do that like in [*].
Regards
[*]
void fit(){
modified_fdscb = new TF1(“modified_fdscb”, modified_fnc_dscb, 0, 2, maxPar);
modified_fdscb->SetParameter(0, 1);
modified_fdscb->FixParameter(0, 1);
…
modified_fdscb->SetParameter(maxpar, 1);
h->Fit(modified_fdscb);
…
modified_fdscb->SetParameter(0, 2); // how can I unfix this parameter?
...
modified_fdscb->SetParameter(maxpar, 1);
h->Fit(modified_fdscb);
}