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examples
descartes-folium.cpp
Go to the documentation of this file.
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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
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/*
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* Main authors:
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* Vincent Barichard <Vincent.Barichard@univ-angers.fr>
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*
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* Copyright:
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* Vincent Barichard, 2012
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*
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* This file is part of Gecode, the generic constraint
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* development environment:
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* http://www.gecode.org
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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#include <
gecode/driver.hh
>
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#include <
gecode/minimodel.hh
>
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#include <
gecode/float.hh
>
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using namespace
Gecode
;
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68
class
DescartesFolium
:
public
FloatMaximizeScript
{
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protected
:
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FloatVarArray
f
;
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double
step
;
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public
:
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DescartesFolium
(
const
Options
&
opt
)
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:
FloatMaximizeScript
(
opt
),
f
(*this,3,-20,20) {
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if
(
opt
.trace() != 0)
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trace
(*
this
,
f
,
opt
.trace());
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// Post equation
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FloatVar
p
=
f
[0];
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FloatVar
x
=
f
[1];
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FloatVar
y
=
f
[2];
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rel
(*
this
, 3*
p
/(1+
pow
(
p
,3)) ==
x
);
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rel
(*
this
, 3*
sqr
(
p
)/(1+
pow
(
p
,3)) ==
y
);
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rel
(*
this
,
pow
(
x
,3) +
pow
(
y
,3) == 3 *
x
*
y
);
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rel
(*
this
,
x
==
FloatVal
(-1,2));
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branch
(*
this
,
p
,
FLOAT_VAL_SPLIT_MIN
());
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}
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DescartesFolium
(
DescartesFolium
&
p
)
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:
FloatMaximizeScript
(
p
) {
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f
.update(*
this
,
p
.f);
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}
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virtual
Space
*
copy
(
void
) {
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return
new
DescartesFolium
(*
this
);
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}
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virtual
FloatVar
cost
(
void
)
const
{
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return
f
[0];
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}
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virtual
void
print
(std::ostream& os)
const
{
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os <<
"XY "
<<
f
[1].med() <<
" "
<<
f
[2].med()
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<< std::endl;
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}
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};
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int
main
(
int
argc,
char
* argv[]) {
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Options
opt
(
"DescartesFolium"
);
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opt
.
solutions
(0);
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opt
.
step
(0.1);
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opt
.
parse
(argc,argv);
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FloatMaximizeScript::run<DescartesFolium,BAB,Options>(
opt
);
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return
0;
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}
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// STATISTICS: example-any
Gecode::pow
void pow(Home home, FloatVar x0, int n, FloatVar x1)
Post propagator for for $n\geq 0$.
Definition:
arithmetic.cpp:109
Gecode::x
Post propagator for SetVar x
Definition:
set.hh:767
Gecode::y
Post propagator for SetVar SetOpType SetVar y
Definition:
set.hh:767
DescartesFolium::DescartesFolium
DescartesFolium(DescartesFolium &p)
Constructor for cloning p.
Definition:
descartes-folium.cpp:94
minimodel.hh
DescartesFolium::main
int main(int argc, char *argv[])
Main-function.
Definition:
descartes-folium.cpp:117
Gecode::sqr
void sqr(Home home, FloatVar x0, FloatVar x1)
Post propagator for .
Definition:
arithmetic.cpp:95
DescartesFolium::copy
virtual Space * copy(void)
Copy during cloning.
Definition:
descartes-folium.cpp:99
Gecode::Space
Computation spaces.
Definition:
core.hpp:1742
Gecode::branch
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:39
driver.hh
Gecode
Gecode toplevel namespace
Test::opt
Options opt
The options.
Definition:
test.cpp:97
DescartesFolium::DescartesFolium
DescartesFolium(const Options &opt)
Actual model.
Definition:
descartes-folium.cpp:76
Gecode::Options
Options for scripts
Definition:
driver.hh:366
float.hh
Gecode::FLOAT_VAL_SPLIT_MIN
FloatValBranch FLOAT_VAL_SPLIT_MIN(void)
Select values not greater than mean of smallest and largest value.
Definition:
val.hpp:55
Gecode::Driver::ScriptBase
Parametric base-class for scripts.
Definition:
driver.hh:729
Gecode::Options::step
void step(double s)
Set default step value.
Definition:
options.hpp:256
DescartesFolium::f
FloatVarArray f
The numbers.
Definition:
descartes-folium.cpp:71
Gecode::BaseOptions::parse
void parse(int &argc, char *argv[])
Parse options from arguments argv (number is argc)
Definition:
options.cpp:548
DescartesFolium::print
virtual void print(std::ostream &os) const
Print solution coordinates.
Definition:
descartes-folium.cpp:107
DescartesFolium::cost
virtual FloatVar cost(void) const
Cost function.
Definition:
descartes-folium.cpp:103
Gecode::FloatVal
Float value type.
Definition:
float.hh:334
Gecode::rel
void rel(Home home, FloatVar x0, FloatRelType frt, FloatVal n)
Propagates .
Definition:
rel.cpp:43
Gecode::FloatVar
Float variables.
Definition:
float.hh:870
Gecode::FloatVarArray
Float variable array.
Definition:
float.hh:1030
Gecode::trace
void trace(Home home, const FloatVarArgs &x, TraceFilter tf, int te, FloatTracer &t)
Create a tracer for float variables.
Definition:
trace.cpp:39
DescartesFolium
Example: Folium of Descartes
Definition:
descartes-folium.cpp:68
Gecode::Options::solutions
void solutions(unsigned int n)
Set default number of solutions to search for.
Definition:
options.hpp:283
DescartesFolium::step
double step
Minimum distance between two solutions.
Definition:
descartes-folium.cpp:73
Gecode::f
Post propagator for f(x \diamond_{\mathit{op}} y) \sim_r z \f$ void rel(Home home
p
int p
Number of positive literals for node type.
Definition:
bool-expr.cpp:232