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Reference Guide
MnUserFcn.cxx
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1 // @(#)root/minuit2:$Id$
2 // Authors: M. Winkler, F. James, L. Moneta, A. Zsenei 2003-2005
3 
4 /**********************************************************************
5  * *
6  * Copyright (c) 2005 LCG ROOT Math team, CERN/PH-SFT *
7  * *
8  **********************************************************************/
9 
10 #include "Minuit2/MnUserFcn.h"
11 #include "Minuit2/FCNBase.h"
13 
14 namespace ROOT {
15 
16  namespace Minuit2 {
17 
18 
20  // call Fcn function transforming from a MnAlgebraicVector of internal values to a std::vector of external ones
21  fNumCall++;
22 
23  // calling fTransform() like here was not thread safe because it was using a cached vector
24  //return Fcn()( fTransform(v) );
25  // make a new thread-safe implementation creating a vector each time
26  // a bit slower few% in stressFit and 10% in Rosenbrock function but it is negligible in big fits
27 
28  // get first initial values of parameter (in case some one is fixed)
29  std::vector<double> vpar(fTransform.InitialParValues().begin(), fTransform.InitialParValues().end() );
30 
31  const std::vector<MinuitParameter>& parameters = fTransform.Parameters();
32  unsigned int n = v.size();
33  for (unsigned int i = 0; i < n; i++) {
34  int ext = fTransform.ExtOfInt(i);
35  if (parameters[ext].HasLimits()) {
36  vpar[ext] = fTransform.Int2ext(i, v(i));
37  }
38  else {
39  vpar[ext] = v(i);
40  }
41  }
42  return Fcn()(vpar);
43 }
44 
45  } // namespace Minuit2
46 
47 } // namespace ROOT
Namespace for new ROOT classes and functions.
Definition: StringConv.hxx:21
double Int2ext(unsigned int, double) const
const FCNBase & Fcn() const
Definition: MnFcn.h:51
unsigned int ExtOfInt(unsigned int internal) const
const MnUserTransformation & fTransform
Definition: MnUserFcn.h:39
virtual double operator()(const MnAlgebraicVector &) const
Definition: MnUserFcn.cxx:19
SVector< double, 2 > v
Definition: Dict.h:5
unsigned int size() const
Definition: LAVector.h:198
const std::vector< MinuitParameter > & Parameters() const
const std::vector< double > & InitialParValues() const
const Int_t n
Definition: legend1.C:16