98 lines
3 KiB
C++
98 lines
3 KiB
C++
// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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//-----------------------------------------------------------------------------
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// eoRandomSelect.h
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// (c) GeNeura Team, 1998
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/*
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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: todos@geneura.ugr.es, http://geneura.ugr.es
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*/
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//-----------------------------------------------------------------------------
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#ifndef EORANDOMSELECT_H
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#define EORANDOMSELECT_H
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//-----------------------------------------------------------------------------
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#include <algorithm>
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#include <numeric> // for accumulate
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#include <functional>
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#include <eoPopOps.h>
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#include <eoUniform.h>
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//-----------------------------------------------------------------------------
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/**
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* eoRandomSelect: an selection operator, which selects randomly a percentage
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of the initial population.
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*/
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template<class EOT> class eoRandomSelect: public eoBinPopOp<EOT>
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{
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public:
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///
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eoRandomSelect(const float& _percent = 0.4):
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eoBinPopOp<EOT>(), repRate(_percent) {};
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///
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virtual ~eoRandomSelect() {};
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/// Takes a percentage of the population randomly, and transfers it to siblings
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virtual void operator() ( eoPop<EOT>& _parents, eoPop<EOT>& _siblings ) {
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// generates random numbers
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eoUniform<unsigned> uniform(0, _parents.size()-1);
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unsigned num_chroms = (unsigned)(repRate * _parents.size());
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// selection of chromosomes
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do {
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_siblings.push_back(_parents[uniform()]);
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} while (_siblings.size() < num_chroms);
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}
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/// @name Methods from eoObject
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//@{
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/**
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* Read object. Reads the percentage
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* Should call base class, just in case.
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* @param _s A istream.
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*/
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virtual void readFrom(istream& _s) {
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_s >> repRate;
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}
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/** Print itself: inherited from eoObject implementation. Declared virtual so that
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it can be reimplemented anywhere. Instance from base classes are processed in
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base classes, so you don<6F>t have to worry about, for instance, fitness.
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@param _s the ostream in which things are written*/
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virtual void printOn( ostream& _s ) const{
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_s << repRate;
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}
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/** Inherited from eoObject
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@see eoObject
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*/
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string className() const {return "eoRandomSelect";};
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//@}
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private:
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float repRate;
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};
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//-----------------------------------------------------------------------------
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#endif EOGSRANDOMSELECT_H
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