#include <TF2.h>
#include <TVirtualFitter.h>

#include <stdio.h>

//______________________________________________________________________________
Double_t func(Double_t *arg, Double_t *par = 0)
{
   Double_t x = arg[0] - 1., y = arg[1] - 2.;
   return x*x + y*y;
}

const Char_t *FittType[] = {"Minuit","Fumili","Minuit2"};
//______________________________________________________________________________
Int_t CheckFitter()
{
   
   TF2 *f2 = new TF2("f2",func,-5.,5.,-5.,5.,0);
   Double_t x, y;
   
   for (Int_t jj = 0; jj < 3; ++jj) {
      TVirtualFitter::SetDefaultFitter(FittType[jj]);
      printf("\n%s:\t",TVirtualFitter::GetDefaultFitter());
      f2->GetMinimumXY(x, y);
      printf("\tMinimum found at x = %lg\t y = %lg\n", x, y);
   }
   
   delete f2;
   return 0;
}