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Example of a program to fit non-equidistant data points. The fitting function fcn is a Root > minuit->mnhelp("*") to see the list of possible keywords. 4 /// Example of a program to fit non-equidistant data points 12 /// Root > TMinuit *minuit = new TMinuit(10);. 13 /// ~~~. 14 ///. 15 /// ~~~{.cpp}. adapted in ROOT to C++. CR (DESY) wwwasdoc.web.cern.ch/wwwasdoc/WWW/minuit/ Example: 1-σ error definition of a Log-Likelihood-function:. be obtained in an interactive ROOT session with: // Root > TMinuit *minuit = new TMinuit(10); // Root > minuit->mnhelp("*") to see the list of possible This is the number which determines, for example, the size of the error matrix of the parameters, since only variable parameters have errors. An important ROOT and Minuit. ROOT. an object-oriented program and library developed by CERN. extensive documentation; plenty of tutorials and examples. MINUIT (now< It was a part of CERN library (written in fortran), but it has been merged/migrate into ROOT and its C++ successors (Minuit++,. Minuit2, etc). Start(); minuit->SetFCN(fcnk0); minuit->SetParameter(0, "Re(X)", 0, 0.1, minuit->ExecuteCommand("CALL FCN", arglist, 1); minuit->FixParameter(2); To take a simple example, in case of ROOT histograms (classes TH1C,TH1S For variable parameters with limits, MINUIT uses the following transformation:.