public IChromosome Mutate(IChromosome c)
{
Random prng = RandomFactory.Instance();
IChromosome ret = c as IChromosome;
int index;
for (int i = 0; i < _numberOfMutations; i++)
{
index = prng.Next(0, ret.Count);
ret = Perturb(ret, index);
}
return(ret);
}
public IChromosome Select(IList <IChromosome> population)
{
if (TournamentSize > population.Count)
{
TournamentSize = population.Count;
}
List <IChromosome> tournament = new List <IChromosome>(TournamentSize);
Random prng = RandomFactory.Instance();
int index;
for (int i = 0; i < TournamentSize; i++)
{
index = prng.Next(population.Count);
tournament.Add(population[index]);
}
return(tournament.Max());
}
public IList <IChromosome> Recombine(IList <IChromosome> parents)
{
IList <IChromosome> children = new IChromosome[ChildrenProduced];
Random prng = RandomFactory.Instance();
int parent, count = parents.First().Count;
for (int i = 0; i < ChildrenProduced; i++)
{
children[i] = parents[i].GetCopy();
for (int j = 0; j < count; j++)
{
// TODO: Generalize to more than 2 parents... but what does ParentFavortism mean then?
parent = (prng.NextDouble() <= ParentFavortism) ? 0 : 1;
children[i][j] = parents[parent][j];
}
}
return(children);
}
private bool DoMutate()
{
Random prng = RandomFactory.Instance();
return((prng.NextDouble() < MutationMechanism.MutationRate) ? true : false);
}