55 lines
2 KiB
C++
55 lines
2 KiB
C++
// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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//-----------------------------------------------------------------------------
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// eoRankingSelect.h
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// (c) GeNeura Team, 1998, Maarten Keijzer 2000, Marc Schoenauer 2001
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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: Marc.Schoenauer@polytechnique.fr
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mak@dhi.dk
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*/
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//-----------------------------------------------------------------------------
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#ifndef eoRankingSelect_h
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#define eoRankingSelect_h
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//-----------------------------------------------------------------------------
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#include <eoSelectFromWorth.h>
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#include <eoRanking.h>
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/** eoRankingSelect: select an individual by roulette wheel on its rank
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* is an eoRouletteWorthSelect, i.e. a selector using a std::vector of worthes
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* rather than the raw fitness (see eoSelectFromWorth.h)
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* uses an internal eoRanking object which is an eoPerf2Worth<EOT, double>
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*/
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template <class EOT>
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class eoRankingSelect: public eoRouletteWorthSelect<EOT, double>
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{
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public:
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/** Ctor:
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* @param _p the selective pressure, should be in [1,2] (2 is the default)
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* @param _e exponent (1 == linear)
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*/
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eoRankingSelect(double _p = 2.0, double _e=1.0):
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eoRouletteWorthSelect<EOT, double>(ranking), ranking(_p, _e) {}
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private :
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eoRanking<EOT> ranking; // derived from eoPerf2Worth
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};
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#endif
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