root fix parameter The TF1 IntegralError method gets the parameter uncertainties and their correlations through its covmat input parameter
The TF1 SetParameters merely initializes the parameters to some values but it does not fix them in any way they can still vary freely in both directions starting from the Yes you can easily fix a single parameter Let s take as fitting example the tutorial combinedFit C There you have a line where a parameter is fixed by calling fix 5 th
root fix parameter
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ROOT Fit ParameterSettings Class Reference Class describing value limits and step size of the parameters Provides functionality also to set retrieve values step sizes limits and fix the parameters To be done add constraints equality Combined simultaneous fit of two histogram with separate functions and some common parameters Minimizer is Minuit2 Migrad Chi2 131 104 NDf 115
Note that when this function is a pre defined function e g gaus one needs to use the fit option B to have the limits used in the fit See TH1 Fit TF1 Option t Option t Double t Double t for the fitting documentation and 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
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The official repository for ROOT analyzing storing and visualizing big data scientifically root project root Skip to content Navigation Menu Toggle navigation Sign in Product GitHub You can fix one or more parameters by specifying the B option when calling the Fit method When a function is not predefined the fit parameters must be initialized to some value as
How to obtain the values of the fit parameters TF1 gfit TF1 h GetFunction gaus gfit GetParameter 0 gfit GetParameter 1 gfit GetParError 0 double par 3 gfit ROOT Fit ParameterSettings Class Reference Class describing value limits and step size of the parameters Provides functionality also to set retrieve values step sizes limits and fix the
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root fix parameter - Combined simultaneous fit of two histogram with separate functions and some common parameters Minimizer is Minuit2 Migrad Chi2 131 104 NDf 115