internal void UpdateFitness()
{
double max = 0.0;
double total = 0.0;
//calculates the max and total fitness in one pass
foreach (int index in members)
{
Organism <T> member = pop.GetMember(index);
double fit = member.Fitness;
if (fit > max)
{
max = fit;
}
total += fit;
}
//updates the average and max fitness
avg_fit = total / members.Count;
max_fit = max;
//increments the age
age = age + 1;
}