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MCParameters.cxx
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1 // @(#)root/mathmore:$Id$
2 // Author: Lorenzo Moneta 11/2010
3 
4  /**********************************************************************
5  * *
6  * Copyright (c) 2007 ROOT Foundation, CERN/PH-SFT *
7  * *
8  * This library is free software; you can redistribute it and/or *
9  * modify it under the terms of the GNU General Public License *
10  * as published by the Free Software Foundation; either version 2 *
11  * of the License, or (at your option) any later version. *
12  * *
13  * This library is distributed in the hope that it will be useful, *
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of *
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
16  * General Public License for more details. *
17  * *
18  * You should have received a copy of the GNU General Public License *
19  * along with this library (see file COPYING); if not, write *
20  * to the Free Software Foundation, Inc., 59 Temple Place, Suite *
21  * 330, Boston, MA 02111-1307 USA, or contact the author. *
22  * *
23  **********************************************************************/
24 //
25 // implementation file for class MCParameters
26 // Author: Lorenzo Moneta , Nov 2010
27 //
28 //
29 
30 #include "Math/MCParameters.h"
31 #include "Math/GenAlgoOptions.h"
32 
33 #include "gsl/gsl_monte_vegas.h"
34 
35 namespace ROOT {
36 namespace Math {
37 
38 
39  /// default VEGAS parameters (copied from gsl/monte/vegas.c)
41  // init default values
42  alpha = 1.5;
43  iterations = 5;
44  stage = 0;
45  mode = GSL_VEGAS_MODE_IMPORTANCE;
46  verbose = -1;
47  }
48 
51  (*this) = opt;
52  }
53 
55  // set parameters from IOptions
56  double val = 0;
57  int ival = 0;
58  bool ret = false;
59 
60  ret = opt.GetRealValue("alpha",val);
61  if (ret) alpha = val;
62  ret = opt.GetIntValue("iterations",ival);
63  if (ret) iterations = ival;
64  ret = opt.GetIntValue("stage",ival);
65  if (ret) stage = ival;
66  ret = opt.GetIntValue("mode",ival);
67  if (ret) mode = ival;
68  ret = opt.GetIntValue("verbose",ival);
69  if (ret) verbose = ival;
70  return *this;
71  }
72 
74  // convert to options (return object is managed by the user)
75  GenAlgoOptions * opt = new GenAlgoOptions();
76  opt->SetRealValue("alpha",alpha);
77  opt->SetIntValue("iterations",iterations);
78  opt->SetIntValue("stage",stage);
79  opt->SetIntValue("mode",mode);
80  opt->SetIntValue("verbose",verbose);
81  return opt;
82  }
83 
84 
85 
86  /// default MISER parameters (copied from gsl/monte/vegas.c)
87 
88 
90  // init default values
91  estimate_frac = 0.1;
92  min_calls = (dim>0) ? 16*dim : 160; // use default dim = 10
94  dither = 0;
95  alpha = 2.0;
96  }
97 
98 
99  MiserParameters::MiserParameters(const IOptions & opt, size_t dim) {
100  SetDefaultValues(dim);
101  (*this) = opt;
102  }
103 
105  // set parameters from IOptions
106  double val = 0;
107  int ival = 0;
108  bool ret = false;
109 
110  ret = opt.GetRealValue("alpha",val);
111  if (ret) alpha = val;
112  ret = opt.GetRealValue("dither",val);
113  if (ret) dither = val;
114  ret = opt.GetRealValue("estimate_frac",val);
115  if (ret) estimate_frac = val;
116  ret = opt.GetIntValue("min_calls",ival);
117  if (ret) min_calls = ival;
118  ret = opt.GetIntValue("min_calls_per_bisection",ival);
119  if (ret) min_calls_per_bisection = ival;
120  return *this;
121  }
122 
124  // convert to options (return object is managed by the user)
125  GenAlgoOptions * opt = new GenAlgoOptions();
126  opt->SetRealValue("alpha",alpha);
127  opt->SetRealValue("dither",dither);
128  opt->SetRealValue("estimate_frac",estimate_frac);
129  opt->SetIntValue("min_calls",min_calls);
130  opt->SetIntValue("min_calls_per_bisection",min_calls_per_bisection);
131  return opt;
132  }
133 
134 
135 } // namespace Math
136 } // namespace ROOT
137 
138 
139 
ROOT::Math::IOptions * operator()() const
convert to options (return object is managed by the user)
void SetDefaultValues(size_t dim=10)
default MISER parameters (copied from gsl/monte/vegas.c)
structures collecting parameters for MISER multidimensional integration
Definition: MCParameters.h:76
virtual bool GetIntValue(const char *, int &) const
Definition: IOptions.h:87
MiserParameters(size_t dim=10)
Definition: MCParameters.h:85
structures collecting parameters for VEGAS multidimensional integration FOr implementation of default...
Definition: MCParameters.h:45
virtual bool GetRealValue(const char *, double &) const
Definition: IOptions.h:85
virtual void SetRealValue(const char *name, double val)
method wich need to be re-implemented by the derived classes
void SetDefaultValues()
default VEGAS parameters (copied from gsl/monte/vegas.c)
ROOT::Math::IOptions * operator()() const
convert to options (return object is managed by the user)
class implementing generic options for a numerical algorithm Just store the options in a map of strin...
MiserParameters & operator=(const ROOT::Math::IOptions &opt)
VegasParameters & operator=(const ROOT::Math::IOptions &opt)
Generic interface for defining configuration options of a numerical algorithm.
Definition: IOptions.h:32
virtual void SetIntValue(const char *name, int val)