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cartesian-heart.cpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Vincent Barichard <Vincent.Barichard@univ-angers.fr>
5  *
6  * Copyright:
7  * Vincent Barichard, 2012
8  *
9  * This file is part of Gecode, the generic constraint
10  * development environment:
11  * http://www.gecode.org
12  *
13  * Permission is hereby granted, free of charge, to any person obtaining
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33 
34 #include <gecode/driver.hh>
35 
36 #include <gecode/minimodel.hh>
37 #include <gecode/float.hh>
38 
39 using namespace Gecode;
40 
63 class CartesianHeart : public Script {
64 protected:
69 public:
72  : Script(opt), f(*this,2,-20,20), step(opt.step()) {
73  int q = 2;
74  FloatNum p = 0.5;
75  // Post equation
76  rel(*this, sqr(f[0]) + 2*sqr(f[1]-p*nroot(abs(f[0]),q)) == 1);
77  branch(*this, f[0], FLOAT_VAL_SPLIT_MIN());
78  branch(*this, f[1], FLOAT_VAL_SPLIT_MIN());
79  }
82  : Script(p), step(p.step) {
83  f.update(*this, p.f);
84  }
86  virtual Space* copy(void) {
87  return new CartesianHeart(*this);
88  }
90  virtual void constrain(const Space& _b) {
91  const CartesianHeart& b = static_cast<const CartesianHeart&>(_b);
92  rel(*this,
93  (f[0] >= (b.f[0].max()+step)) ||
94  (f[1] >= (b.f[1].max()+step)) ||
95  (f[1] <= (b.f[1].min()-step)));
96  }
98  virtual void print(std::ostream& os) const {
99  os << "XY " << f[0].med() << " " << f[1].med()
100  << std::endl;
101  }
102 
103 };
104 
108 int main(int argc, char* argv[]) {
109  Options opt("CartesianHeart");
110  opt.solutions(0);
111  opt.step(0.01);
112  opt.parse(argc,argv);
113  Script::run<CartesianHeart,BAB,Options>(opt);
114  return 0;
115 }
116 
117 // STATISTICS: example-any
struct Gecode::@602::NNF::@65::@66 b
For binary nodes (and, or, eqv)
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:232
Example: Cartesian Heart
int main(int argc, char *argv[])
Main-function.
CartesianHeart(const Options &opt)
Actual model.
CartesianHeart(CartesianHeart &p)
Constructor for cloning p.
virtual void print(std::ostream &os) const
Print solution coordinates.
FloatNum step
Minimum distance between two solutions.
virtual void constrain(const Space &_b)
Add constraints to current model to get next solution (not too close)
virtual Space * copy(void)
Copy during cloning.
FloatVarArray f
The numbers.
void parse(int &argc, char *argv[])
Parse options from arguments argv (number is argc)
Definition: options.cpp:548
Parametric base-class for scripts.
Definition: driver.hh:729
Float variable array.
Definition: float.hh:1030
Options for scripts
Definition: driver.hh:366
void solutions(unsigned int n)
Set default number of solutions to search for.
Definition: options.hpp:283
void step(double s)
Set default step value.
Definition: options.hpp:256
Computation spaces.
Definition: core.hpp:1742
FloatValBranch FLOAT_VAL_SPLIT_MIN(void)
Select values not greater than mean of smallest and largest value.
Definition: val.hpp:55
void sqr(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
Definition: arithmetic.cpp:95
void abs(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
Definition: arithmetic.cpp:41
void nroot(Home home, FloatVar x0, int n, FloatVar x1)
Post propagator for for $n\geq 0$.
Definition: arithmetic.cpp:118
void rel(Home home, FloatVar x0, FloatRelType frt, FloatVal n)
Propagates .
Definition: rel.cpp:43
double FloatNum
Floating point number base type.
Definition: float.hh:106
const Gecode::FloatNum step
Definition: arithmetic.cpp:785
Single _b(1, 4)
Options opt
The options.
Definition: test.cpp:97