CLHEP VERSION Reference Documentation
   
CLHEP Home Page     CLHEP Documentation     CLHEP Bug Reports

LogisticFunction.cc
Go to the documentation of this file.
1 // -*- C++ -*-
2 // $Id:
5 #include <assert.h>
6 #define MAXRANGE 1000
7 
8 namespace Genfun {
9 FUNCTION_OBJECT_IMP(LogisticFunction)
10 
12  _x0("X0", 0.0,0.0,1.0),
13  _a("A",2.0,1.0, 4.0)
14 {}
15 
17 }
18 
20 AbsFunction(right),
21 _x0(right._x0),
22 _a(right._a)
23 {
24 }
25 
26 double LogisticFunction::operator() (double x) const {
27  int i = (int) (x+0.5), &back = i, end=back+1;
28 
29  if (i<0 || i>MAXRANGE) {
30  return 0;
31  }
32  else {
33  // Is the vector of values stale?
34  if (__a!=_a.getValue() || __x0!=_x0.getValue()) {
35 
36  // Empty the vector
37  fx.erase(fx.begin(),fx.end());
38 
39  // And update the cache.
40  __a = _a.getValue();
41  __x0 = _x0.getValue();
42 
43  }
44 
45 
46  if (fx.empty()) fx.push_back(__x0);
47 
48  while (fx.size()<size_t(end)) {
49  double v = fx.back();
50  fx.push_back(__a*v*(1.0-v));
51  }
52 
53  return fx[i];
54  }
55 
56 
57 }
58 
60  return _x0;
61 }
62 
64  return _a;
65 }
66 
67 const Parameter & LogisticFunction::x0() const {
68  return _x0;
69 }
70 
71 const Parameter & LogisticFunction::a() const {
72  return _a;
73 }
74 
75 
76 } // namespace Genfun
Genfun::LogisticFunction::LogisticFunction
LogisticFunction()
Definition: LogisticFunction.cc:11
Genfun::Parameter::getValue
virtual double getValue() const
Definition: Parameter.cc:27
Genfun::AbsFunction
Definition: CLHEP/GenericFunctions/AbsFunction.hh:48
Genfun::LogisticFunction::x0
Parameter & x0()
Definition: LogisticFunction.cc:59
Genfun::LogisticFunction::a
Parameter & a()
Definition: LogisticFunction.cc:63
LogisticFunction.hh
Variable.hh
MAXRANGE
#define MAXRANGE
Definition: LogisticFunction.cc:6
v
they are gone ZOOM Features Discontinued The following features of the ZOOM package were felt to be extreme overkill These have been after checking that no existing user code was utilizing as in SpaceVector v
Definition: keyMergeIssues.doc:324
i
long i
Definition: JamesRandomSeeding.txt:27
Genfun::LogisticFunction
Definition: CLHEP/GenericFunctions/LogisticFunction.hh:20
Genfun::Parameter
Definition: CLHEP/GenericFunctions/Parameter.hh:35
x
any side effects of that construction would occur twice The semantics of throw x
Definition: whyZMthrowRethrows.txt:37
FUNCTION_OBJECT_IMP
#define FUNCTION_OBJECT_IMP(classname)
Definition: CLHEP/GenericFunctions/AbsFunction.hh:156
Genfun::LogisticFunction::operator()
virtual double operator()(double argument) const
Definition: LogisticFunction.cc:26
Genfun
Definition: CLHEP/GenericFunctions/Abs.hh:14
Genfun::LogisticFunction::~LogisticFunction
virtual ~LogisticFunction()
Definition: LogisticFunction.cc:16