Quad8F.h

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// @(#)root/minuit2:$Id$
// Authors: M. Winkler, F. James, L. Moneta, A. Zsenei   2003-2005

/**********************************************************************
 *                                                                    *
 * Copyright (c) 2005 LCG ROOT Math team,  CERN/PH-SFT                *
 *                                                                    *
 **********************************************************************/

#include "Minuit2/FCNBase.h"

namespace ROOT {

   namespace Minuit2 {


class Quad8F : public FCNBase {

public:

  double operator()(const std::vector<double>& par) const {

    double x = par[0];
    double y = par[1];
    double z = par[2];
    double w = par[3];
    double x0 = par[4];
    double y0 = par[5];
    double z0 = par[6];
    double w0 = par[7];


    return ( (1./70.)*(21*x*x + 20*y*y + 19*z*z - 14*x*z - 20*y*z) + w*w + (1./70.)*(21*x0*x0 + 20*y0*y0 + 19*z0*z0 - 14*x0*z0 - 20*y0*z0) + w0*w0 );
  }

  double Up() const {return 1.;}

private:

};

  }  // namespace Minuit2

}  // namespace ROOT