[#1] INFO:Fitting -- RooAbsPdf::fitTo(model) fixing normalization set for coefficient determination to observables in data
[#1] INFO:Fitting -- using generic CPU library compiled with no vectorizations
[#1] INFO:Fitting -- Creation of NLL object took 459.243 μs
[#1] INFO:Fitting -- RooAddition::defaultErrorLevel(nll_model_modelData) Summation contains a RooNLLVar, using its error level
[#1] INFO:Minimization -- [fitFCN] No discrete parameters, performing continuous minimization only
[#1] INFO:Minimization --  Including the following constraint terms in minimization: (fconstraint)
[#1] INFO:Minimization -- The global observables are not defined , normalize constraints with respect to the parameters (f)
[#1] INFO:Fitting -- RooAbsPdf::fitTo(modelc) fixing normalization set for coefficient determination to observables in data
[#1] INFO:Fitting -- Creation of NLL object took 1.65644 ms
[#1] INFO:Fitting -- RooAddition::defaultErrorLevel(nll_modelc_modelData) Summation contains a RooNLLVar, using its error level
[#1] INFO:Minimization -- [fitFCN] No discrete parameters, performing continuous minimization only
[#1] INFO:Minimization --  Including the following constraint terms in minimization: (fconstext)
[#1] INFO:Minimization -- The global observables are not defined , normalize constraints with respect to the parameters (f,m,s)
[#1] INFO:Fitting -- RooAbsPdf::fitTo(model) fixing normalization set for coefficient determination to observables in data
[#1] INFO:Fitting -- Creation of NLL object took 120.582 μs
[#1] INFO:Fitting -- RooAddition::defaultErrorLevel(nll_model_modelData) Summation contains a RooNLLVar, using its error level
[#1] INFO:Minimization -- [fitFCN] No discrete parameters, performing continuous minimization only
fit result without constraint (data generated at f=0.5)

  RooFitResult: minimized FCN value: 134.849, estimated distance to minimum: 2.11658e-05
                covariance matrix quality: Full, accurate covariance matrix
                Status : MINIMIZE=0 HESSE=0 

    Floating Parameter  InitialValue    FinalValue +/-  Error     GblCorr.
  --------------------  ------------  --------------------------  --------
                     f    5.0000e-01    6.4987e-01 +/-  1.21e-01  <none>
                     m    0.0000e+00    7.1824e-01 +/-  4.97e-01  <none>
                     s    2.0000e+00    2.1880e+00 +/-  4.61e-01  <none>

fit result with internal constraint (data generated at f=0.5, constraint is f=0.8+/-0.2)

  RooFitResult: minimized FCN value: 134.191, estimated distance to minimum: 0.000427811
                covariance matrix quality: Full, accurate covariance matrix
                Status : MINIMIZE=0 HESSE=0 

    Floating Parameter  InitialValue    FinalValue +/-  Error     GblCorr.
  --------------------  ------------  --------------------------  --------
                     f    6.4987e-01    6.8952e-01 +/-  1.01e-01  <none>
                     m    7.1824e-01    7.0939e-01 +/-  4.97e-01  <none>
                     s    2.1880e+00    2.2657e+00 +/-  4.74e-01  <none>

fit result with (another) external constraint (data generated at f=0.5, constraint is f=0.2+/-0.1)

  RooFitResult: minimized FCN value: 137.195, estimated distance to minimum: 0.000256905
                covariance matrix quality: Full, accurate covariance matrix
                Status : MINIMIZE=0 HESSE=0 

    Floating Parameter  InitialValue    FinalValue +/-  Error     GblCorr.
  --------------------  ------------  --------------------------  --------
                     f    6.8952e-01    3.6252e-01 +/-  8.15e-02  <none>
                     m    7.0939e-01    7.1394e-01 +/-  5.87e-01  <none>
                     s    2.2657e+00    1.7027e+00 +/-  4.74e-01  <none>