112 lines
3.6 KiB
C++
112 lines
3.6 KiB
C++
/** -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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-----------------------------------------------------------------------------
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eoTruncatedSelectOne.h
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(c) Maarten Keijzer, Marc Schoenauer, GeNeura Team, 2002
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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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Marc.Schoenauer@inria.fr
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mkeijzer@dhi.dk
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*/
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//-----------------------------------------------------------------------------
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#ifndef _eoTruncatedSelectOne_h
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#define _eoTruncatedSelectOne_h
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//-----------------------------------------------------------------------------
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#include <eoSelect.h>
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#include <eoSelectOne.h>
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#include <utils/eoHowMany.h>
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#include <math.h>
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//-----------------------------------------------------------------------------
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/** eoTruncatedSelectOne selects one individual using eoSelectOne as it's
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mechanism. Therefore eoTruncatedSelectOne needs an eoSelectOne in its ctor
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It will perform selection only from the top guys in the population.
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@ingroup Selectors
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*/
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template<class EOT>
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class eoTruncatedSelectOne : public eoSelectOne<EOT>
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{
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public:
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/** Ctor from rate and bool */
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eoTruncatedSelectOne(eoSelectOne<EOT>& _select,
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double _rateFertile,
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bool _interpret_as_rateF = true)
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: select(_select),
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howManyFertile(_rateFertile, _interpret_as_rateF),
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tmpPop(), actualPop(tmpPop)
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{}
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/** Ctor with eoHowMany */
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eoTruncatedSelectOne(eoSelectOne<EOT>& _select,
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eoHowMany _howManyFertile)
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: select(_select), howManyFertile(_howManyFertile),
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tmpPop(), actualPop(tmpPop)
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{}
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/** setup procedures: fills the temporary population with the fertile guys */
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void setup(const eoPop<EOT>& _source)
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{
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unsigned fertile = howManyFertile(_source.size());
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if (fertile == _source.size()) // noting to do, all are fertile
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{
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actualPop = _source;
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}
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else
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{
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// copy only best ferile to actualPop
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tmpPop.resize(fertile);
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std::vector<const EOT *> result;
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_source.nth_element(fertile, result);
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for (unsigned i=0; i<fertile; i++)
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tmpPop[i] = *result[i];
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// and just in case
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actualPop = tmpPop;
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}
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// AND DON'T FORGET to call the embedded select setup method on actualPop
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select.setup(actualPop);
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return;
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}
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/**
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The implementation selects an individual from the fertile pop
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@param _pop the source population
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@return the selected guy
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*/
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const EOT& operator()(const eoPop<EOT>& _pop)
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{
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return select(actualPop);
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}
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private :
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eoSelectOne<EOT>& select; // selector for one guy
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eoHowMany howManyFertile; // number of fertile guys
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eoPop<EOT> tmpPop; // intermediate population - fertile guys
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eoPop<EOT> & actualPop; // to avoid copies when 100% fertility
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};
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#endif
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