GEPChromosomeMutOp.cpp

#include "GEPChromosomeMutOp.h"
 
namespace GEP{
    void GEPChromosomeMutOp::registerParameters(StateP state)
    {
        myGenotype_->registerParameter(state, "mut.simple", (voidP) new double(0), ECF::DOUBLE);
    }
 
 
    bool GEPChromosomeMutOp::initialize(StateP state)
    {
        voidP sptr = myGenotype_->getParameterValue(state, "mut.simple");
        probability_ = *((double*)sptr.get());
 
        return true;
    }
    bool GEPChromosomeMutOp::mutate(GenotypeP gene){
        GEPChromosome* chr = (GEPChromosome*)(gene.get());
        // mutate a single random point in the genotype by selecting a random primitive
        // Select a random gene
        uint iGene = state_->getRandomizer()->getRandomInteger(0, chr->genes - 1);
        uint geneOffset = iGene * chr->geneLength;
        // Select a random point in the head+tail
        uint iPoint = state_->getRandomizer()->getRandomInteger(0, (uint)(chr->headLength+chr->tailLength) - 1);
        std::stringstream logstr;
        logstr << "Mutating node (" << iPoint << ") in gene [" << iGene << "]...";
        ECF_LOG(state_, 5, logstr.str());
        // get primitive depending on where the selected point is
        // head points can change into anything; tail points must be terminals
        chr->at(geneOffset + iPoint)->setPrimitive(iPoint < chr->headLength ? chr->primitiveSet_->getRandomPrimitive() : chr->primitiveSet_->getRandomTerminal());
        return true;
    }
}