Generated on Sat Jan 20 2018 22:21:10 for Gecode by doxygen 1.8.13
descartes-folium.cpp
Go to the documentation of this file.
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  * Last modified:
10  * $Date: 2016-05-24 10:22:30 +0200 (Tue, 24 May 2016) $ by $Author: schulte $
11  * $Revision: 15079 $
12  *
13  * This file is part of Gecode, the generic constraint
14  * development environment:
15  * http://www.gecode.org
16  *
17  * Permission is hereby granted, free of charge, to any person obtaining
18  * a copy of this software and associated documentation files (the
19  * "Software"), to deal in the Software without restriction, including
20  * without limitation the rights to use, copy, modify, merge, publish,
21  * distribute, sublicense, and/or sell copies of the Software, and to
22  * permit persons to whom the Software is furnished to do so, subject to
23  * the following conditions:
24  *
25  * The above copyright notice and this permission notice shall be
26  * included in all copies or substantial portions of the Software.
27  *
28  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
29  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
30  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
31  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
32  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
33  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
34  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
35  *
36  */
37 
38 #include <gecode/driver.hh>
39 
40 #include <gecode/minimodel.hh>
41 #include <gecode/float.hh>
42 
43 using namespace Gecode;
44 
73 protected:
77  double step;
78 public:
81  : FloatMaximizeScript(opt), f(*this,3,-20,20) {
82 
83  if (opt.trace() != 0)
84  trace(*this, f, opt.trace());
85 
86  // Post equation
87  FloatVar p = f[0];
88  FloatVar x = f[1];
89  FloatVar y = f[2];
90  rel(*this, 3*p/(1+pow(p,3)) == x);
91  rel(*this, 3*sqr(p)/(1+pow(p,3)) == y);
92  rel(*this, pow(x,3) + pow(y,3) == 3 * x * y);
93  rel(*this, x == FloatVal(-1,2));
94 
95  branch(*this,p,FLOAT_VAL_SPLIT_MIN());
96  }
99  : FloatMaximizeScript(share,p) {
100  f.update(*this,share,p.f);
101  }
103  virtual Space* copy(bool share) {
104  return new DescartesFolium(share,*this);
105  }
107  virtual FloatVar cost(void) const {
108  return f[0];
109  }
111  virtual void print(std::ostream& os) const {
112  os << "XY " << f[1].med() << " " << f[2].med()
113  << std::endl;
114  }
115 
116 };
117 
121 int main(int argc, char* argv[]) {
122  Options opt("DescartesFolium");
123  opt.solutions(0);
124  opt.step(0.1);
125  opt.parse(argc,argv);
126  FloatMaximizeScript::run<DescartesFolium,BAB,Options>(opt);
127  return 0;
128 }
129 
130 // STATISTICS: example-any
void branch(Home home, const FloatVarArgs &x, FloatVarBranch vars, FloatValBranch vals, FloatBranchFilter bf, FloatVarValPrint vvp)
Branch over x with variable selection vars and value selection vals.
Definition: branch.cpp:43
DescartesFolium(const Options &opt)
Actual model.
virtual Space * copy(bool share)
Copy during cloning.
int main(int argc, char *argv[])
Main-function.
void pow(Home home, FloatVar x0, int n, FloatVar x1)
Post propagator for for $n 0$.
Definition: arithmetic.cpp:113
FloatVarArray f
The numbers.
Float variable array.
Definition: float.hh:1031
Computation spaces.
Definition: core.hpp:1748
DescartesFolium(bool share, DescartesFolium &p)
Constructor for cloning p.
Parametric base-class for scripts.
Definition: driver.hh:703
void update(Space &, bool share, VarArray< Var > &a)
Update array to be a clone of array a.
Definition: array.hpp:1072
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:236
Options opt
The options.
Definition: test.cpp:101
void step(double s)
Set default step value.
Definition: options.hpp:260
void sqr(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
Definition: arithmetic.cpp:99
void trace(int f)
Set trace flags.
Definition: options.hpp:503
FloatValBranch FLOAT_VAL_SPLIT_MIN(void)
Select values not greater than mean of smallest and largest value.
Definition: val.hpp:59
void parse(int &argc, char *argv[])
Parse options from arguments argv (number is argc)
Definition: options.cpp:510
virtual void print(std::ostream &os) const
Print solution coordinates.
Post propagator for SetVar SetOpType SetVar y
Definition: set.hh:784
Float value type.
Definition: float.hh:338
void rel(Home home, FloatVar x0, FloatRelType frt, FloatVal n)
Propagates .
Definition: rel.cpp:47
void solutions(unsigned int n)
Set default number of solutions to search for.
Definition: options.hpp:287
double step
Minimum distance between two solutions.
Post propagator for SetVar x
Definition: set.hh:784
void trace(Home home, const FloatVarArgs &x, TraceFilter tf, int te, FloatTracer &t)
Create a tracer for float variables.
Definition: trace.cpp:43
Float variables.
Definition: float.hh:874
Gecode toplevel namespace
Options for scripts
Definition: driver.hh:366
virtual FloatVar cost(void) const
Cost function.
Example: Folium of Descartes