GSLMultiFitFunctionWrapper.h

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// @(#)root/mathmore:$Id: GSLMultiFitFunctionWrapper.h 22522 2008-03-07 16:07:51Z moneta $
// Authors: L. Moneta Dec 2006 

 /**********************************************************************
  *                                                                    *
  * Copyright (c) 2004 ROOT Foundation,  CERN/PH-SFT                   *
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  * This library is free software; you can redistribute it and/or      *
  * modify it under the terms of the GNU General Public License        *
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// Header file for class GSLMultiMinFunctionWrapper
// 
// Created by: moneta  at Sat Nov 13 14:54:41 2004
// 
// Last update: Sat Nov 13 14:54:41 2004
// 
#ifndef ROOT_Math_GSLMultiFitFunctionWrapper
#define ROOT_Math_GSLMultiFitFunctionWrapper

#include "gsl/gsl_multifit.h"

#include "GSLMultiFitFunctionAdapter.h"


#include <cassert>

namespace ROOT {
namespace Math {



   typedef double ( * GSLMultiFitFPointer ) ( const gsl_vector *, void *, gsl_vector *);
   typedef void   ( * GSLMultiFitDfPointer )   ( const gsl_vector *, void *, gsl_matrix *);
   typedef void   ( * GSLMultiFitFdfPointer ) ( const gsl_vector *, void *, gsl_vector *, gsl_matrix *);


/**
   wrapper to a multi-dim function withtout  derivatives for multi-dimensional 
   minimization algorithm

   @ingroup MultiMin
*/

class GSLMultiFitFunctionWrapper { 

public: 

   GSLMultiFitFunctionWrapper() 
   {
      fFunc.f = 0; 
      fFunc.df = 0; 
      fFunc.fdf = 0; 
      fFunc.n = 0; 
      fFunc.p = 0; 
      fFunc.params = 0;
   }


   /// Fill gsl function structure from a C++ function iterator and size and number of residuals
   template<class FuncVector> 
   void SetFunction(const FuncVector & f, unsigned int nres, unsigned int npar  ) { 
      const void * p = &f;
      assert (p != 0); 
      fFunc.f   = &GSLMultiFitFunctionAdapter<FuncVector >::F;
      fFunc.df  = &GSLMultiFitFunctionAdapter<FuncVector >::Df;
      fFunc.fdf = &GSLMultiFitFunctionAdapter<FuncVector >::FDf;
      fFunc.n = nres; 
      fFunc.p = npar; 
      fFunc.params =  const_cast<void *>(p); 
   }
   
   gsl_multifit_function_fdf * GetFunc() { return &fFunc; } 


  private: 
   
   gsl_multifit_function_fdf fFunc; 

};



} // namespace Math
} // namespace ROOT

#endif /* ROOT_Math_GSLMultiMinFunctionWrapper */

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