/// <summary>
/// The constructor.
/// </summary>
/// <param name="theGraph">The graph that we are seeking a minimal path through.</param>
/// <param name="theAntCount">The number of ants to use.</param>
public DiscreteACO(ICostGraph theGraph, int theAntCount)
{
Alpha = 1;
Beta = 5;
Evaporation = 0.5;
Q = 500;
PR = 0.01;
Random = new MersenneTwisterGenerateRandom();
int len = theGraph.Count;
_graph = theGraph;
_pheromone = new double[len][];
_bestPath = new int[len];
_bestCost = double.PositiveInfinity;
for (int i = 0; i < len; i++)
{
_pheromone[i] = new double[len];
for (int j = 0; j < len; j++)
{
_pheromone[i][j] = INITIAL_PHEROMONE;
}
}
for (int i = 0; i < theAntCount; i++)
{
_ants.Add(new DiscreteAnt(len));
}
}
/// <summary>
/// Calculate the cost, up to the current point.
/// </summary>
/// <param name="currentIndex">The current point.</param>
/// <param name="graph">The cost graph.</param>
/// <returns>The current cost.</returns>
public double CalculateCost(int currentIndex, ICostGraph graph)
{
double length = graph.Cost(_path[currentIndex - 1], _path[0]);
for (int i = 0; i < currentIndex - 1; i++)
{
length += graph.Cost(_path[i], _path[i + 1]);
}
return(length);
}
/// <summary>
/// The constructor.
/// </summary>
/// <param name="theGraph">The graph that we are seeking a minimal path through.</param>
/// <param name="theAntCount">The number of ants to use.</param>
public DiscreteACO(ICostGraph theGraph, int theAntCount)
{
Alpha = 1;
Beta = 5;
Evaporation = 0.5;
Q = 500;
PR = 0.01;
Random = new MersenneTwisterGenerateRandom();
int len = theGraph.Count;
_graph = theGraph;
_pheromone = new double[len][];
_bestPath = new int[len];
_bestCost = double.PositiveInfinity;
for (int i = 0; i < len; i++)
{
_pheromone[i] = new double[len];
for (int j = 0; j < len; j++)
{
_pheromone[i][j] = INITIAL_PHEROMONE;
}
}
for (int i = 0; i < theAntCount; i++)
{
_ants.Add(new DiscreteAnt(len));
}
}
/// <summary>
/// Calculate the cost, up to the current point.
/// </summary>
/// <param name="currentIndex">The current point.</param>
/// <param name="graph">The cost graph.</param>
/// <returns>The current cost.</returns>
public double CalculateCost(int currentIndex, ICostGraph graph)
{
double length = graph.Cost(_path[currentIndex - 1], _path[0]);
for (int i = 0; i < currentIndex - 1; i++)
{
length += graph.Cost(_path[i], _path[i + 1]);
}
return length;
}
