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Reference Guide
FcnAdapter.h
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1 // @(#)root/mathcore:$Id$
2 // Author: L. Moneta 10/2005
3 
4 /**********************************************************************
5  * *
6  * Copyright (c) 2005 ROOT Foundation, CERN/PH-SFT *
7  * *
8  **********************************************************************/
9 
10 #ifndef ROOT_Fit_FcnAdapter_H_
11 #define ROOT_Fit_FcnAdapter_H_
12 
13 #include "Math/IFunction.h"
14 
15 
16 //___________________________________________________________
17 //
18 // Adapt the interface used in TMinuit (and the TVirtualFitter) for
19 // passing the objective function in a IFunction interface
20 // (ROOT::Math::IMultiGenFunction)
21 //
22 
23 namespace ROOT {
24 
25  namespace Fit {
26 
28 
29 public:
30 
31  FcnAdapter(void (*fcn)(int&, double*, double&, double*, int ), int dim = 0) :
32  fDim(dim),
33  fFCN(fcn)
34  {}
35 
36  virtual ~FcnAdapter() {}
37 
38  virtual unsigned int NDim() const { return fDim; }
39 
41  return new FcnAdapter(fFCN,fDim);
42  }
43 
44  void SetDimension(int dim) { fDim = dim; }
45 
46 private:
47 
48  virtual double DoEval(const double * x) const {
49  double fval = 0;
50  int dim = fDim;
51  // call with flag 4
52  fFCN(dim, 0, fval, const_cast<double *>(x), 4);
53  return fval;
54  }
55 
56 private:
57 
58  unsigned int fDim;
59  void (*fFCN)(int&, double*, double&, double*, int);
60 
61 
62 };
63 
64  } // end namespace Fit
65 
66 } // end namespace ROOT
67 
68 #endif //ROOT_Fit_FcnAdapter
Returns the available number of logical cores.
Definition: StringConv.hxx:21
FcnAdapter(void(*fcn)(int &, double *, double &, double *, int), int dim=0)
Definition: FcnAdapter.h:31
void(* fFCN)(int &, double *, double &, double *, int)
Definition: FcnAdapter.h:59
Double_t x[n]
Definition: legend1.C:17
virtual unsigned int NDim() const
Retrieve the dimension of the function.
Definition: FcnAdapter.h:38
ROOT::Math::IMultiGenFunction * Clone() const
Clone a function.
Definition: FcnAdapter.h:40
virtual ~FcnAdapter()
Definition: FcnAdapter.h:36
Documentation for the abstract class IBaseFunctionMultiDim.
Definition: IFunction.h:62
TFitResultPtr Fit(FitObject *h1, TF1 *f1, Foption_t &option, const ROOT::Math::MinimizerOptions &moption, const char *goption, ROOT::Fit::DataRange &range)
Definition: HFitImpl.cxx:134
typedef void((*Func_t)())
unsigned int fDim
Definition: FcnAdapter.h:58
void SetDimension(int dim)
Definition: FcnAdapter.h:44
virtual double DoEval(const double *x) const
Definition: FcnAdapter.h:48