80 lines
2.3 KiB
C++
80 lines
2.3 KiB
C++
// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
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//-----------------------------------------------------------------------------
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// eoRandomRealWeightUp.h
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// (c) OPAC 2007
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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: thomas.legrand@lifl.fr
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*/
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//-----------------------------------------------------------------------------
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#ifndef EORANDOMREALWEIGHTUP_H
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#define EORANDOMREALWEIGHTUP_H
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//-----------------------------------------------------------------------------
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#include <eoWeightUpdater.h>
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#include <utils/eoRNG.h>
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//-----------------------------------------------------------------------------
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/**
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* Update an inertia weight by assigning it an (uniform) random value.
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* The weight is a basic feature to evaluate the velocity of a particle in
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* swarm optimization.
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*
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* @ingroup Variators
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*/
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class eoRandomRealWeightUp:public eoWeightUpdater<double>
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{
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public:
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/**
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* Default constructor
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* @param _min - The minimum bound for the weight
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* @param _max - The maximum bound for the weight
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*/
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eoRandomRealWeightUp(
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double _min,
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double _max
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):min(_min),max(_max)
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{
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// consistency check
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if (min > max)
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{
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std::string s;
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s.append (" min > max in eoRandomRealWeightUp");
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throw std::runtime_error (s);
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}
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}
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/**
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* Generate an real random number in [min,max] and assign it to _weight
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* @param _weight - The assigned (real) weight
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*/
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void operator() (double & _weight)
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{
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_weight=rng.uniform(max-min)+min;
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}
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protected:
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double min,max;
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};
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#endif/*EORANDOMREALWEIGHTUP_H*/
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