100 lines
2.6 KiB
C++
100 lines
2.6 KiB
C++
/** -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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//-----------------------------------------------------------------------------
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// eoRealAtomXover.h : helper classes for std::vector<real> crossover
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// (c) Marc Schoenauer 2001
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Contact: marc.schoenauer@polytechnique.fr http://eeaax.cmap.polytchnique.fr/
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*/
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//-----------------------------------------------------------------------------
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/** Some basic atomic crossovers for doubles
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*
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* Are used in all ES specifici crossovers
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* and will be in more general stuff, using the generic crossovers
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*/
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#ifndef _eoRealAtomXover_H
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#define _eoRealAtomXover_H
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#include <utils/eoRNG.h>
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#include <eoOp.h>
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/**
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Discrete crossover == exchange of values
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*
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* @ingroup Real
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* @ingroup Variators
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*/
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class eoDoubleExchange: public eoBinOp<double>
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{
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public:
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/**
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* (Default) Constructor.
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*/
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eoDoubleExchange() {}
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/// The class name. Used to display statistics
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virtual std::string className() const { return "eoDoubleExchange"; }
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/**
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Exchanges or not the values
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*/
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bool operator()(double& r1, const double& r2)
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{
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if (eo::rng.flip())
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if (r1 != r2) // if r1 == r2 you must return false
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{
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r1 = r2;
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return true;
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}
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return false;
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}
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};
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/**
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Intermediate crossover == linear combination
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*
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* @ingroup Real
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* @ingroup Variators
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*/
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class eoDoubleIntermediate: public eoBinOp<double>
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{
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public:
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/**
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* (Default) Constructor.
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*/
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eoDoubleIntermediate() {}
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/// The class name. Used to display statistics
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virtual std::string className() const { return "eoDoubleIntermediate"; }
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/**
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Linear combination of both parents
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*/
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bool operator()(double& r1, const double& r2)
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{
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double alpha = eo::rng.uniform();
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r1 = alpha * r2 + (1-alpha) * r1;
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return true;
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}
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};
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#endif
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