File: ExSampler2.h

package info (click to toggle)
herwig%2B%2B 2.6.0-1
  • links: PTS, VCS
  • area: main
  • in suites: jessie, jessie-kfreebsd
  • size: 27,128 kB
  • ctags: 24,739
  • sloc: cpp: 188,949; fortran: 23,193; sh: 11,365; python: 5,069; ansic: 3,539; makefile: 1,865; perl: 2
file content (209 lines) | stat: -rw-r--r-- 4,485 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
// -*- C++ -*-
//
// ExSampler.h is a part of Herwig++ - A multi-purpose Monte Carlo event generator
// Copyright (C) 2002-2012 The Herwig Collaboration
//
// Herwig++ is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef Herwig_ExSampler_H
#define Herwig_ExSampler_H
//
// This is the declaration of the ExSampler class.
//

#include "BinSampler.h"
#include "Herwig++/Exsample2/exsample/generator.h"

namespace Herwig {

using namespace ThePEG;

/**
 * \ingroup Matchbox
 * \brief Interface to the exsample generator.
 * \author Simon Platzer
 *
 * @see \ref ExSamplerInterfaces "The interfaces"
 * defined for ExSampler.
 */
class ExSampler: public Herwig::BinSampler {

public:

  /** @name Standard constructors and destructors. */
  //@{
  /**
   * The default constructor.
   */
  ExSampler();

  /**
   * The destructor.
   */
  virtual ~ExSampler();
  //@}

public:

  /**
   * Return true, if this bin sampler produces unweighted events.
   */
  virtual bool isUnweighting() const { return true; }

  /**
   * Return true, if this sampler is in a compensating mode.
   */
  virtual bool compensating() const { return generator_.compensating(); }

  /**
   * Generate the next point; store the point in lastPoint() and its
   * weight using select(); if noMaxInfo is true, do not throw
   * NewMaximum or UpdateCrossSections exceptions.
   */
  virtual void generate(bool noMaxInfo = false);

  /**
   * Initialize this bin sampler. This default version calls runIteration.
   */
  virtual void initialize(bool progress);

  /**
   * Finalize this sampler.
   */
  virtual void finalize(bool verbose);

public:

  /**
   * Reject an event.
   */
  virtual void reject() {
    GeneralStatistics::reject();
    generator_.reject();
  }

public:

  /**
   * Evaluate with given random numbers.
   */
  double evaluate(const vector<double>& p) const {
    double ret;
    try {
      ret = eventHandler()->dSigDR(p) / nanobarn;
    } catch (Veto&) {
      ret = 0.0;
    } catch (...) {
      throw;
    }
    return ret;
  }

  /**
   * Return the lower left and upper right
   * corners of the support of this function
   */
  pair<vector<double>,vector<double> > support() const {
    vector<double> lower(dimension(),0.);
    vector<double> upper(dimension(),1.);
    return make_pair(lower,upper);
  }

  /**
   * Indicate start of presampling
   */
  void start_presampling() { }

  /**
   * Indicate end of presampling
   */
  void stop_presampling() { }

public:

  /** @name Functions used by the persistent I/O system. */
  //@{
  /**
   * Function used to write out object persistently.
   * @param os the persistent output stream written to.
   */
  void persistentOutput(PersistentOStream & os) const;

  /**
   * Function used to read in object persistently.
   * @param is the persistent input stream read from.
   * @param version the version number of the object when written.
   */
  void persistentInput(PersistentIStream & is, int version);
  //@}

  /**
   * The standard Init function used to initialize the interfaces.
   * Called exactly once for each class by the class description system
   * before the main function starts or
   * when this class is dynamically loaded.
   */
  static void Init();

protected:

  /** @name Clone Methods. */
  //@{
  /**
   * Make a simple clone of this object.
   * @return a pointer to the new object.
   */
  virtual IBPtr clone() const;

  /** Make a clone of this object, possibly modifying the cloned object
   * to make it sane.
   * @return a pointer to the new object.
   */
  virtual IBPtr fullclone() const;
  //@}


// If needed, insert declarations of virtual function defined in the
// InterfacedBase class here (using ThePEG-interfaced-decl in Emacs).

private:

  /**
   * The number of presampling points.
   */
  unsigned long presampling_points_;

  /**
   * The number of points below which the grid is frozen
   */
  unsigned long freeze_grid_;

  /**
   * The efficiency threshold
   */
  double efficiency_threshold_;

  /**
   * The gains threshold.
   */
  double gain_threshold_;

  /**
   * The generator used.
   */
  exsample::generator<ExSampler,UseRandom> generator_;

private:

  /**
   * The assignment operator is private and must never be called.
   * In fact, it should not even be implemented.
   */
  ExSampler & operator=(const ExSampler &);

};

}

#endif /* Herwig_ExSampler_H */