ga/src/mutations/randomfloat.cpp

/********************************************************************************
 *  FARSA Genetic Algorithm Library                                             *
 *  Copyright (C) 2007-2008 Gianluca Massera <emmegian@yahoo.it>                *
 *                                                                              *
 *  This program is free software; you can redistribute it and/or modify        *
 *  it under the terms of the GNU General Public License as published by        *
 *  the Free Software Foundation; either version 2 of the License, or           *
 *  (at your option) any later version.                                         *
 *                                                                              *
 *  This program is distributed in the hope that it will be useful,             *
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of              *
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               *
 *  GNU General Public License for more details.                                *
 *                                                                              *
 *  You should have received a copy of the GNU General Public License           *
 *  along with this program; if not, write to the Free Software                 *
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA  *
 ********************************************************************************/

#include "mutations/randomfloat.h"
#include "core/genotype.h"
#include "randomgenerator.h"
#include "genotypes/doublegenotype.h"

namespace farsa {

RandomFloat::RandomFloat()
    : Mutation() {
}

RandomFloat::~RandomFloat() {
    //--- nothing to do
}

void RandomFloat::mutate( Genotype* gen ) {
    DoubleGenotype* rgen = dynamic_cast<DoubleGenotype*>( gen );
    Q_ASSERT_X( rgen != 0,
                "RandomFloat::mutate",
                "In order to use RandomFloat mutation the Genotypes must be a subclass of DoubleGenotype" );
    double min = rgen->minValue();
    double max = rgen->maxValue();
    for( unsigned int i=0; i<rgen->numGenes(); i++ ) {
        if ( globalRNG->getBool( mutationRate( rgen->geneToBitIndex(i) ) ) ) {
            rgen->set( i, globalRNG->getDouble( min, max ) );
        }
    }
}

void RandomFloat::describe( QString type ) {
    Mutation::describe( type );
    addTypeDescription( type, "Mutation operator", "Replace a real value with a random one with the probability specified by mutation_rate parameter" );
}

} // end namespace farsa