ROOT Version: 6.18/00 Platform: Red Hat 8.5.0-16 Compiler: gcc version 8.5.0 Hello everyone, I want to fit a histogram (see figure) with the crystal ball function following the code: TF1 *fitFunction = new TF1("fitFunction", "crystalball", 84, 105); fitFunction->SetParameters(p0, p1, p2, p3, p…

Try: fitFunction->Print(); [image] Fitting Data with user defined function ROOT "crystalball" = "[Constant] * ROOT::Math::crystalball_function(x, [Alpha], [N], [Sigma], [Mean])" Wikipedia → Crystal Ball function ; ROOT::Math::crystalball_function ; ${ROOTSYS}/tutorials…

Crystal ball function initial parameters

Newbie

Wile_E_Coyote April 15, 2023, 9:18am 2

Try: fitFunction->Print();