74 lines
2.4 KiB
C++
74 lines
2.4 KiB
C++
/** -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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-----------------------------------------------------------------------------
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eoSelectPerc.h
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(c) Maarten Keijzer, GeNeura Team, 2000
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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 _eoSelectPerc_h
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#define _eoSelectPerc_h
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//-----------------------------------------------------------------------------
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#include <eoSelect.h>
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#include <eoSelectOne.h>
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#include <math.h>
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//-----------------------------------------------------------------------------
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/** eoSelectPerc selects many individuals using eoSelectOne as it's
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mechanism. Therefore eoSelectPerc needs an eoSelectOne in its ctor
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It will select floor(rate*pop.size()) individuals and pushes them to
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the back of the destination population.
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@ingroup Selectors
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*/
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template<class EOT>
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class eoSelectPerc : public eoSelect<EOT>
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{
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public:
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/// init
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eoSelectPerc(eoSelectOne<EOT>& _select, float _rate = 1.0)
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: select(_select), rate(_rate) {}
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/**
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The implementation selects a percentage
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@param _source the source population
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@param _dest the resulting population (size of this population is the number of times eoSelectOne is called. It empties the destination and adds the selection into it)
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*/
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virtual void operator()(const eoPop<EOT>& _source, eoPop<EOT>& _dest)
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{
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size_t target = static_cast<size_t>(floor(rate * _source.size()));
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_dest.resize(target);
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select.setup(_source);
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for (size_t i = 0; i < _dest.size(); ++i)
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_dest[i] = select(_source);
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}
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private :
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eoSelectOne<EOT>& select;
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float rate;
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};
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#endif
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