TF1 does not take fitted parameters

Newbie
4

Hi,
to help you we need your complete macro+ histo
and your complete log.
You only show the output of Minuit which looks fine
At least the following works as expected.

void fitp1()
{
   auto f1 = new TF1("f1", "pol1", 0, 100);
   f1->SetParameters(0, 0.1);
   auto h1 = new TH1F("h1", "h1", 100, 0, 100);
   h1->FillRandom("f1");
   h1->Draw();
   f1->SetParameters(1, 0.5);
   h1->Fit("f1");
   printf("p0 = %f p1 = %f\n", 
   f1->GetParameter(0), f1->GetParameter(1));
}

Otto