/// <summary>
/// Constructor
/// </summary>
/// <param name="lowerBound">Lowerbound value</param>
/// <param name="upperBound">Upperbound value</param>
public Real(double lowerBound, double upperBound)
{
lowerBound_ = lowerBound;
upperBound_ = upperBound;
value_ = PseudoRandom.Instance().NextDouble() * (upperBound - lowerBound) + lowerBound;
//Contract.Requires((value_ >= lowerBound_) && (value_ <= upperBound_));
} //Real
public override object execute(object obj)
{
// <pex>
if (obj == (object)null)
{
throw new ArgumentNullException("obj");
}
if (obj != (object)null && !(obj is SolutionSet))
{
throw new ArgumentException("complex reason", "obj");
}
// </pex>
SolutionSet solutionSet = (SolutionSet)obj;
Solution solution1;
Solution solution2;
///// OJO, FALTA CONTROLAR SI EL SOLUTION ESTA VACIO O TIENE UN SOLO ELEMENTO
int sol1 = PseudoRandom.Instance().Next(0, solutionSet.size() - 1);
int sol2 = PseudoRandom.Instance().Next(0, solutionSet.size() - 1);
int sol3 = PseudoRandom.Instance().Next(0, solutionSet.size() - 1);
solution1 = solutionSet[sol1];
solution2 = solutionSet[sol2];
while (sol1 == sol2)
{
sol2 = PseudoRandom.Instance().Next(0, solutionSet.size() - 1);
solution2 = solutionSet[sol2];
}
int result = comparator_.Compare(solution1, solution2);
if (result == -1)
{
return(solution1);
}
else if (result == 1)
{
return(solution2);
}
else
{
if (PseudoRandom.Instance().NextDouble() < 0.5)
{
return(solution1);
}
else
{
return(solution2);
}
}
}
public static PseudoRandom Instance()
{
if (PseudoRandom_ == null)
{
lock (mutex_)
{
if (PseudoRandom_ == null)
PseudoRandom_ = new PseudoRandom();
}
}
return PseudoRandom_;
}
public static PseudoRandom Instance()
{
if (PseudoRandom_ == null)
{
lock (mutex_)
{
if (PseudoRandom_ == null)
{
PseudoRandom_ = new PseudoRandom();
}
}
}
return(PseudoRandom_);
}
static public void execute(int[] perm, int size)
{
// <pex>
if (perm == (int[])null)
{
throw new ArgumentNullException("perm");
}
if (perm.Length < 2)
{
throw new ArgumentException("perm.Length < 2", "perm");
}
// </pex>
int[] index = new int[size];
bool[] flag = new bool[size];
for (int n = 0; n < size; n++)
{
index[n] = n;
flag[n] = true;
}
int num = 0;
while (num < size)
{
int start = PseudoRandom.Instance().Next(0, size - 1);
//int start = int(size*nd_uni(&rnd_uni_init));
while (true)
{
if (flag[start])
{
perm[num] = index[start];
flag[start] = false;
num++;
break;
}
if (start == (size - 1))
{
start = 0;
}
else
{
start++;
}
}
}
// while
} // randomPermutation
public override object execute(object obj)
{
Object[] parameters = (Object[])obj;
Solution current = (Solution)parameters[0];
Solution[] parent = (Solution[])parameters[1];
//if ((Array.Find (validTypes, n => n == parent[0].type_.GetType ()) == null) ||
// (Array.Find (validTypes, n => n == parent[1].type_.GetType ()) == null) ||
// (Array.Find (validTypes, n => n == parent[2].type_.GetType ()) == null))
// //Console.WriteLine ("DiffentialEvolution. Types are incompatible");
//else
// ;
//Console.WriteLine ("Differential evolution. Types are Compatible");
int numberOfVariables = current.numberOfVariables_;
double jrand = PseudoRandom.Instance().Next(numberOfVariables);
Solution child = new Solution(current);
if (DE_Variant_.CompareTo("rand/1/bin") == 0)
{
for (int j = 0; j < numberOfVariables; j++)
{
if (PseudoRandom.Instance().NextDouble() < CR_ || j == jrand)
{
double val;
val = parent[2].variable_[j].value_ + F_ * (parent[0].variable_[j].value_ - parent[1].variable_[j].value_);
if (val < child.variable_[j].lowerBound_)
{
val = child.variable_[j].value_ = child.variable_[j].lowerBound_;
}
if (val > child.variable_[j].upperBound_)
{
val = child.variable_[j].value_ = child.variable_[j].upperBound_;
}
child.variable_[j].value_ = val;
}
else
{
child.variable_[j].value_ = current.variable_[j].value_;
} // else
} // for
} // if
return(child);
}
} //Binary
public Binary(int numberOfBits)
{
numberOfBits_ = numberOfBits;
bits_ = new BitArray(numberOfBits_);
for (int i = 0; i < numberOfBits_; i++)
{
if (PseudoRandom.Instance().NextDouble() < 0.5)
{
bits_[i] = true;
}
else
{
bits_[i] = false;
}
}
} //Binary
private void doMutation(Solution x)
{
double rnd, delta1, delta2, mut_pow, deltaq;
double y, yl, yu, val, xy;
double eta_m = distributionIndex_;
for (int var = 0; var < x.numberOfVariables_; var++)
{
if (PseudoRandom.Instance().NextDouble() <= mutationProbability_)
{
y = x.variable_[var].value_;
yl = x.variable_[var].lowerBound_;
yu = x.variable_[var].upperBound_;
delta1 = (y - yl) / (yu - yl);
delta2 = (yu - y) / (yu - yl);
rnd = PseudoRandom.Instance().NextDouble();
mut_pow = 1.0 / (eta_m + 1.0);
if (rnd <= 0.5)
{
xy = 1.0 - delta1;
val = 2.0 * rnd + (1.0 - 2.0 * rnd) * (Math.Pow(xy, (eta_m + 1.0)));
deltaq = Math.Pow(val, mut_pow) - 1.0;
}
else
{
xy = 1.0 - delta2;
val = 2.0 * (1.0 - rnd) + 2.0 * (rnd - 0.5) * (Math.Pow(xy, (eta_m + 1.0)));
deltaq = 1.0 - (Math.Pow(val, mut_pow));
}
y = y + deltaq * (yu - yl);
if (y < yl)
{
y = yl;
}
if (y > yu)
{
y = yu;
}
x.variable_[var].value_ = y;
}
}
}
Solution[] doCrossover(Solution parent1, Solution parent2)
{
Solution[] offSpring = new Solution[2];
offSpring[0] = new Solution(parent1);
offSpring[1] = new Solution(parent2);
int i;
double rand;
double y1, y2, yL, yu;
double c1, c2;
double alpha, beta, betaq;
double valueX1, valueX2;
Solution x1 = parent1;
Solution x2 = parent2;
Solution offs1 = offSpring[0];
Solution offs2 = offSpring[1];
int numberOfVariables = x1.numberOfVariables_;
if (PseudoRandom.Instance().NextDouble() <= crossoverProbability_)
{
for (i = 0; i < numberOfVariables; i++)
{
valueX1 = x1.variable_[i].value_;
valueX2 = x2.variable_[i].value_;
if (PseudoRandom.Instance().NextDouble() <= 0.5)
{
if (Math.Abs(valueX1 - valueX2) > EPS)
{
if (valueX1 < valueX2)
{
y1 = valueX1;
y2 = valueX2;
}
else
{
y1 = valueX2;
y2 = valueX1;
}
// if
yL = x1.variable_[i].lowerBound_;
yu = x1.variable_[i].upperBound_;
rand = PseudoRandom.Instance().NextDouble();
beta = 1.0 + (2.0 * (y1 - yL) / (y2 - y1));
alpha = 2.0 - Math.Pow(beta, -(distributionIndex_ + 1.0));
if (rand <= (1.0 / alpha))
{
betaq = Math.Pow((rand * alpha), (1.0 / (distributionIndex_ + 1.0)));
}
else
{
betaq = Math.Pow((1.0 / (2.0 - rand * alpha)), (1.0 / (distributionIndex_ + 1.0)));
}
// if
c1 = 0.5 * ((y1 + y2) - betaq * (y2 - y1));
beta = 1.0 + (2.0 * (yu - y2) / (y2 - y1));
alpha = 2.0 - Math.Pow(beta, -(distributionIndex_ + 1.0));
if (rand <= (1.0 / alpha))
{
betaq = Math.Pow((rand * alpha), (1.0 / (distributionIndex_ + 1.0)));
}
else
{
betaq = Math.Pow((1.0 / (2.0 - rand * alpha)), (1.0 / (distributionIndex_ + 1.0)));
}
// if
c2 = 0.5 * ((y1 + y2) + betaq * (y2 - y1));
if (c1 < yL)
{
c1 = yL;
}
if (c2 < yL)
{
c2 = yL;
}
if (c1 > yu)
{
c1 = yu;
}
if (c2 > yu)
{
c2 = yu;
}
if (PseudoRandom.Instance().NextDouble() <= 0.5)
{
offs1.variable_[i].value_ = c2;
offs2.variable_[i].value_ = c1;
}
else
{
offs1.variable_[i].value_ = c1;
offs2.variable_[i].value_ = c2;
}
// if
}
else
{
offs1.variable_[i].value_ = valueX1;
offs2.variable_[i].value_ = valueX2;
}
// if
}
else
{
offs1.variable_[i].value_ = valueX2;
offs2.variable_[i].value_ = valueX1;
}
// if
}
// if
}
// if
return(offSpring);
}
