Dear ROOT Users,
I have some questions about the RooFit::fitTo() parameters when I want to impose GaussianConstraint in the fit.
Here is the code:
RooGaussian meanconst("meanconst","",*gaumean,RooFit::RooConst(0),RooConst(0)) ;
RooGaussian sigmaconst("sigmaconst","",*gausigma,RooFit::RooConst(gausigma_val),RooConst(gausigma_err)) ;
RooArgSet constset(meanconst, sigmaconst);
allpdf->fitTo(*ds2, RooFit::Save(), RooFit::Extended(), RooFit::Minos(1), RooFit::ExternalConstraints(constset));
I have no idea about ExternalConstraints in the fitTo method, can someone explain the code?
Best regards.