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changes on eoLottery

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gustavo 1999-02-03 20:42:57 +00:00
commit a44af3e7f4
1 changed files with 10 additions and 12 deletions
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22
eo/src/eoLottery.h
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@ -7,10 +7,14 @@
//----------------------------------------------------------------------------- //-----------------------------------------------------------------------------
#include <eo> #include <values.h> // MINFLOAT
#include <numeric> // accumulate
#include <eo> // eoPop eoSelect
//----------------------------------------------------------------------------- //-----------------------------------------------------------------------------
// eoLottery /// eoLottery: a selection method.
/// requires that the fitness type of the chromosome inherits from eoFitness
/// or have a cast to float implemented
//----------------------------------------------------------------------------- //-----------------------------------------------------------------------------
template<class Chrom> class eoLottery: public eoSelect<Chrom> template<class Chrom> class eoLottery: public eoSelect<Chrom>
@ -18,7 +22,7 @@ template<class Chrom> class eoLottery: public eoSelect<Chrom>
public: public:
/// (Default) Constructor. /// (Default) Constructor.
eoLottery(const float& _rate = 1.0): rate(_rate) {} eoLottery(const float& _rate = 1.0): rate(_rate) {}
/// ///
void operator()(const eoPop<Chrom>& pop, eoPop<Chrom>& breeders) const void operator()(const eoPop<Chrom>& pop, eoPop<Chrom>& breeders) const
{ {
@ -26,15 +30,9 @@ template<class Chrom> class eoLottery: public eoSelect<Chrom>
vector<float> score(pop.size()); vector<float> score(pop.size());
// calculates accumulated scores for chromosomes // calculates accumulated scores for chromosomes
transform(pop.begin(), pop.end(), score.begin(), fitness);
for (unsigned i = 0; i < pop.size(); i++) for (unsigned i = 0; i < pop.size(); i++)
score[i] = pop[i].fitness(); score[i] = pop[i].fitness();
float sum = accumulate(score.begin(), score.end(), MINFLOAT); float sum = accumulate(score.begin(), score.end(), MINFLOAT);
transform(score.begin(), score.end(), score.begin(), transform(score.begin(), score.end(), score.begin(),
bind2nd(divides<float>(), sum)); bind2nd(divides<float>(), sum));
@ -44,7 +42,7 @@ template<class Chrom> class eoLottery: public eoSelect<Chrom>
vector<float> random(pop.size()); vector<float> random(pop.size());
generate(random.begin(), random.end(), eoUniform<float>(0,1)); generate(random.begin(), random.end(), eoUniform<float>(0,1));
sort(random.begin(), random.end(), less<float>()); sort(random.begin(), random.end(), less<float>());
// selection of chromosomes // selection of chromosomes
unsigned score_index = 0; // position in score vector unsigned score_index = 0; // position in score vector
unsigned random_index = 0; // position in random vector unsigned random_index = 0; // position in random vector
@ -63,7 +61,7 @@ template<class Chrom> class eoLottery: public eoSelect<Chrom>
num_chroms - breeders.size(), pop.back()); num_chroms - breeders.size(), pop.back());
} while (breeders.size() < num_chroms); } while (breeders.size() < num_chroms);
} }
private: private:
float rate; // selection rate float rate; // selection rate
}; };