NumericalMinimization.C File Reference

Detailed Description

Example on how to use the Minimizer class in ROOT.

Show usage with all the possible minimizers. Minimize the Rosenbrock function (a 2D -function)

input : minimizer name + algorithm name randomSeed: = <0 : fixed value: 0 random with seed 0; >0 random with given seed

 
#include "Math/Minimizer.h"
#include "Math/Factory.h"
#include "Math/Functor.h"
#include "TRandom2.h"
#include "TError.h"
#include <iostream>
 
double RosenBrock(const double *xx )
{
  const double x = xx[0];
  const double y = xx[1];
  const double tmp1 = y-x*x;
  const double tmp2 = 1-x;
  return 100*tmp1*tmp1+tmp2*tmp2;
}
 
int NumericalMinimization(const char * minName = "Minuit2",
                          const char *algoName = "" ,
                          int randomSeed = -1)
{
   // create minimizer giving a name and a name (optionally) for the specific
   // algorithm
   // possible choices are:
   //     minName                  algoName
   // Minuit /Minuit2             Migrad, Simplex,Combined,Scan  (default is Migrad)
   //  Minuit2                     Fumili2
   //  Fumili
   //  GSLMultiMin                ConjugateFR, ConjugatePR, BFGS,
   //                              BFGS2, SteepestDescent
   //  GSLMultiFit
   //   GSLSimAn
   //   Genetic
   ROOT::Math::Minimizer* minimum =
      ROOT::Math::Factory::CreateMinimizer(minName, algoName);
   if (!minimum) {
      std::cerr << "Error: cannot create minimizer \"" << minName
                << "\". Maybe the required library was not built?" << std::endl;
      return 1;
   }
 
   // set tolerance , etc...
   minimum->SetMaxFunctionCalls(1000000); // for Minuit/Minuit2
   minimum->SetMaxIterations(10000);  // for GSL
   minimum->SetTolerance(0.001);
   minimum->SetPrintLevel(1);
 
   // create function wrapper for minimizer
   // a IMultiGenFunction type
   ROOT::Math::Functor f(&RosenBrock,2);
   double step[2] = {0.01,0.01};
   // starting point
 
   double variable[2] = { -1.,1.2};
   if (randomSeed >= 0) {
      TRandom2 r(randomSeed);
      variable[0] = r.Uniform(-20,20);
      variable[1] = r.Uniform(-20,20);
   }
 
   minimum->SetFunction(f);
 
   // Set the free variables to be minimized !
   minimum->SetVariable(0,"x",variable[0], step[0]);
   minimum->SetVariable(1,"y",variable[1], step[1]);
 
   // do the minimization
   minimum->Minimize();
 
   const double *xs = minimum->X();
   std::cout << "Minimum: f(" << xs[0] << "," << xs[1] << "): "
             << minimum->MinValue()  << std::endl;
 
   // expected minimum is 0
   if ( minimum->MinValue()  < 1.E-4 )
      std::cout << "Minimizer " << minName << " - " << algoName
                << "   converged to the right minimum" << std::endl;
   else {
      std::cout << "Minimizer " << minName << " - " << algoName
                << "   failed to converge !!!" << std::endl;
      Error("NumericalMinimization","fail to converge");
   }
 
   return 0;
}

Author

Lorenzo Moneta

Definition in file NumericalMinimization.C.