Introduction

There are a few fitting algorithms available.

MCMC

Standard Metropolis–Rosenbluth–Rosenbluth–Teller–Teller

Minuit

Uses ROOT-based library, for more see: https://root.cern.ch/root/htmldoc/guides/minuit2/Minuit2.html

Choice

To use MCMC you need:

mcmc* Fitter = new mcmc(Manager);

If you are interested in MINUIT

MinuitFit* Fitter = new MinuitFit(Manager);

Then simply

  for(unsigned int i = 0; sample.size(); i++)
    Fitter ->addSamplePDF(sample[i]);
  for(unsigned int i = 0; Cov.size(); i++)
    Fitter ->addSystObj(Cov[i]);

  Fitter ->RunLLHScan(); // can run LLH scan
  Fitter ->runMCMC(); //or run actual fit

Factory

There is implemented Factory method which allow to select algorithm based on config setting

General:
  FittingAlgorithm: "MCMC"

or

General:
  FittingAlgorithm: "PSO"

MaCh3Factory.cpp