Using minuit to minimize chi2 and estimate errors

Newbie
8

@moneta I have found some sample code Numerical Minimization with ROOT::Math::Functor and I am able to run it. If I change min = ROOT.Math.Factory.CreateMinimizer("GSLMultiMin", "BFGS") to min = ROOT.Math.Factory.CreateMinimizer("Minuit2", "") I get an error:

    min.SetMaxFunctionCalls(1000000)
ReferenceError: attempt to access a null-pointer

but min = ROOT.Math.Factory.CreateMinimizer("Minuit", "") works. Is it obvious? any explanation?

EDIT: I did not install minuit2 , that’s it