/// <summary>
/// 1. Dynamic rate mute operator
/// </summary>
/// <param name="chrom">The individual to mutate</param>
/// <returns>A mutated individual</returns>
public Chromosome DRM(Chromosome chrom)
{
int nVar, nmu, it, MaxIt;
int[] muLocation;//
double a, b, sm;
nVar = chrom.chromosome.Length;
//double[] chromosomeTemp = chrom.chromosome;
double[] Fai0;
//Chromosome chromTemp =(Chromosome)DeepClone(chrom);// deep clone not work
Chromosome chromTemp = Chromosome.Clone <Chromosome>(chrom);//use this method doing deep copy
nmu = Convert.ToInt32(Math.Ceiling(chrom.MutationProbability * nVar));
if (nmu > nVar)
{
nmu = nVar;
}
muLocation = myRandom.NextUnique(1, nVar, nmu); //生成nmu个1~nVar之间的随机整数，突变的位置，突变一个或多个元素
Fai0 = myRandom.NextDouble(-1, 1, 10, nVar); //产生[-1, 1]之间随机数行向量
b = 1.0; a = 10.0;
it = chrom.CurrentIteration;
MaxIt = chrom.MaxIteration;
double waveNum = 3;
//sm = 1.0 / 3.0 * Math.Atan(a * Math.Pow((1.0 - 2.0 * (it/ MaxIt)), b)) + 0.5;//% 数 ,3 * it决定有3个波段
sm = 1.0 / 3.0 * Math.Atan(a * Math.Pow(1.0 - 2.0 * (((waveNum * it) % MaxIt) / MaxIt), b)) + 0.5;//% 数 ,3 * it决定有3个波段
for (int i = 0; i < muLocation.Length; i++)
{
for (int j = 0; j < nVar; j++)
{
if (muLocation[i] == j)
{
//chromosomeTemp[i] = chrom.chromosome[i] + 0.5 * sm * Fai0[i]* (chrom.UpperBd[i] - chrom.LowerBd[i]);// 0.5 *[1, 0] *[-1, 1] *[区间长度];
chromTemp.chromosome[i] = chrom.chromosome[i] + 0.5 * sm * Fai0[i] * (chrom.UpperBd[i] - chrom.LowerBd[i]);// 0.5 *[1, 0] *[-1, 1] *[区间长度];
}
//chrom.chromosome[i] = chromosomeTemp[i];//
}
}
chromTemp.Fit = double.MaxValue;
chromTemp.CheckBoundary();
chromTemp.SetChromDecimalPlace();
return(chromTemp);
}//DRM
/// <summary>
/// 2. Simplex crossover:Da Ronco C C, Benini E. GeDEA-II: A simplex crossover based evolutionary algorithm
/// including the genetic diversity as objective[J]. Engineering Letters, 2013, 21(1): 23-35.
/// </summary>
/// <param name="mom">parnet 1</param>
/// <param name="dad">parent 2</param>
/// <returns>two children</returns>
public List <Chromosome> CrossOver_SPX(Chromosome mom, Chromosome dad)
{
List <Chromosome> result = new List <Chromosome>();
Chromosome child1 = Chromosome.Clone <Chromosome>(mom); //use this method doing deep copy
Chromosome child2 = Chromosome.Clone <Chromosome>(dad);
double Refl = myRandom.NextDouble(0, 0.5); //Generates a uniform random number between 0 and 0.5
double Refl2 = myRandom.NextDouble(0.5, 1);
double n = 2.0;
double M;
if (mom.Fit < dad.Fit)
{
for (int i = 0; i < mom.ChromosomeSize; i++)
{
M = mom.chromosome[i] / n;
child1.chromosome[i] = (1 + Refl) * M - Refl * dad.chromosome[i];
child2.chromosome[i] = (1 + Refl2) * M - Refl2 * dad.chromosome[i];
}
}
else
{
for (int i = 0; i < mom.ChromosomeSize; i++)
{
M = dad.chromosome[i] / n;
child1.chromosome[i] = (1 + Refl) * M - Refl * mom.chromosome[i];
child2.chromosome[i] = (1 + Refl2) * M - Refl2 * mom.chromosome[i];
}
}
child1.Fit = double.MaxValue;//Fit need re-compute,so here give a great value
child2.Fit = double.MaxValue;
child1.CheckBoundary();
child1.SetChromDecimalPlace();
child2.CheckBoundary();
child2.SetChromDecimalPlace();
result.Add(child1);
result.Add(child2);
return(result);
}
public Chromosome ChaoticLS(Chromosome chrom) //Jia D , Zheng G , Khan M K . An effective memetic differential evolution algorithm based on chaotic local search[J]. Information ences, 2011, 181(15):3175-3187.
{
Chromosome betterChrom = Chromosome.Clone <Chromosome>(chrom); //use this method doing deep copy
double beta = myRandom.NextDouble(0.0, 1.0);
double u = 4.0, m = 1000;
double betac, lambda;
int Sl = (int)Math.Round(chrom.ChromosomeSize / 5.0);
if (Sl < 1)
{
Sl = 1;
}
int[] loc = myRandom.NextUnique(0, chrom.ChromosomeSize - 1, Sl);
//Random ran = new Random(Guid.NewGuid().GetHashCode());
while (true)
{
if (beta != 0.25 && beta != 0.5 && beta != 0.75)
{
break;
}
beta = myRandom.NextDouble(0.0, 1.0);
}
for (int i = 0; i < chrom.PopulationSize * 5; i++)
{
beta = u * beta * (1 - beta);
foreach (var j in loc)
{
betac = chrom.LowerBd[j] + beta * (chrom.UpperBd[j] - chrom.LowerBd[j]);
if (chrom.Fit > 0.0)
{
lambda = 1 - Math.Pow(Math.Abs((chrom.Fit - 1) / chrom.Fit), m);
}
else
{
lambda = 1 - Math.Pow(Math.Abs((chrom.Fit + 1) / chrom.Fit), m);
}
betterChrom.chromosome[j] = (1 - lambda) * chrom.chromosome[j] + lambda * betac;
}
betterChrom.CheckBoundary();
betterChrom.SetChromDecimalPlace();
betterChrom.SolveFitness();
if (betterChrom.Fit < chrom.Fit)
{
//Console.WriteLine("local search find a better individuals!");
break;
}
}
if (betterChrom.Fit < chrom.Fit)
{
return(betterChrom);
}
else
{
return(chrom);
}
}