Using the new Minimizer class on ROOT 5

[Anita_Lavania]

Hello,

I am facing problems while using the new Minimizer class in ROOT5. Following is the minimization part of a code I am trying to run:

  const char * minName = "Minuit2" ;
  const char *algoName = "" ;
  int randomSeed = -1 ;

   ROOT::Math::Minimizer* min = 
      ROOT::Math::Factory::CreateMinimizer(minName, algoName);
   min->SetMaxFunctionCalls(10000000); // for Minuit/Minuit2 
   min->SetMaxIterations(10000000);  // for GSL 
   min->SetTolerance(0.001);
   min->SetPrintLevel(4);

   ROOT::Math::Functor f(&likelihood,30);
   min->SetFunction(f);

  for(int j=0; j<npar; j++) { 
     min->SetVariable(j, parName[j].c_str(), par[j], stepSize[j]);
   }
    min->Minimize(); 
 
   cout<<"Covariance matrix status: "<<min->CovMatrixStatus()<<endl;
   double covmat[30][30];
   min->GetCovMatrix(*covmat) ;

   cout<<"Covariance matrix..."<<endl;
   for(int i=0; i<30; i++) {
      for(int j=0; j<30; j++) {
          cout<<covmat[i][j]<<"\t" ;
      }
      cout<<endl;
   }
  const double *outpar = min->X();
  const double *err = min->Errors();

On running it with ROOT5, I get the following error:

Error in <TUnixSystem::DynamicPathName>: Minuit2[.so | .dll | .dylib | .sl | .dl | .a] does not exist in /home/anita/root/lib:/usr/lib/x86_64-linux-gnu:/home/anita/products/RooUnfold/:/home/anita/products/EVTGEN/external/HepMC/lib:/home/anita/products/EVTGEN/external/PHOTOS/lib:/home/anita/products/pythia8235/lib:/home/anita/products/EVTGEN/external/TAUOLA/lib:/home/anita/products/EVTGEN/evtgen/lib:/home/anita/HEP/GEANT/GEANT4.10/geant4.10.00.p04-install/lib:/home/anita/HEP/CLHEP/clhep-2.1.4.1/CLHEP-install/lib:/home/anita/HEP/GEANT/GEANT4.10/geant4.10.00.p04-install/lib:/home/anita/root/lib::/home/anita/HEP/CLHEP/clhep-2.1.4.1/CLHEP-install/lib:/home/anita/products/pythia8235/lib:/home/anita/products/gsl25/lib:/home/anita/products/fastjet-3.3.2-install/lib:.:/home/anita/root/lib::/home/anita/root/cint/cint/stl
Error: illegal pointer to class object min 0x0 1729  MinimizerCheck.C:714:
*** Interpreter error recovered ***

Afterwards, I tried to run one of the similar ROOT tutorials, NumericalMinimization.C. I again got the following error:

Processing NumericalMinimization.C...
Error in <TUnixSystem::DynamicPathName>: Minuit2[.so | .dll | .dylib | .sl | .dl | .a] does not exist in /home/anita/root/lib:/usr/lib/x86_64-linux-gnu:/home/anita/products/RooUnfold/:/home/anita/products/EVTGEN/external/HepMC/lib:/home/anita/products/EVTGEN/external/PHOTOS/lib:/home/anita/products/pythia8235/lib:/home/anita/products/EVTGEN/external/TAUOLA/lib:/home/anita/products/EVTGEN/evtgen/lib:/home/anita/HEP/GEANT/GEANT4.10/geant4.10.00.p04-install/lib:/home/anita/HEP/CLHEP/clhep-2.1.4.1/CLHEP-install/lib:/home/anita/HEP/GEANT/GEANT4.10/geant4.10.00.p04-install/lib:/home/anita/root/lib::/home/anita/HEP/CLHEP/clhep-2.1.4.1/CLHEP-install/lib:/home/anita/products/pythia8235/lib:/home/anita/products/gsl25/lib:/home/anita/products/fastjet-3.3.2-install/lib:.:/home/anita/root/lib::/home/anita/root/cint/cint/stl
Error: illegal pointer to class object min 0x0 1729  NumericalMinimization.C:51:
*** Interpreter error recovered ***

I do not understand the problem. Is there any way I can use this Minimizer class with ROOT5?
Also, these codes work perfectly fine with ROOT6.

Thanks for any help.

Anita

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[Wile_E_Coyote]

Check if your ROOT has “minuit2” enabled:
root-config --features

If not, you will need to rebuild your ROOT 5 from scratch.

Try to run the macro version which comes with your ROOT:
${ROOTSYS}/tutorials/fit/NumericalMinimization.C

[Anita_Lavania]

Thank you for your help. It appears I indeed did not enable minuit2 while installing ROOT5, but did enable it for ROOT6.
Thanks again!

Anita