/// <summary>
/// Create a symbolic expression tree using 'RampedHalfAndHalf' strategy.
/// Half the trees are created with the 'Grow' method, and the other half are created with the 'Full' method.
/// </summary>
/// <param name="random">Random generator</param>
/// <param name="grammar">Available tree grammar</param>
/// <param name="maxTreeLength">Maximum tree length (this parameter is ignored)</param>
/// <param name="maxTreeDepth">Maximum tree depth</param>
/// <returns></returns>
public static ISymbolicExpressionTree Create(IRandom random, ISymbolicExpressionGrammar grammar, int maxTreeLength, int maxTreeDepth)
{
var tree = new SymbolicExpressionTree();
var rootNode = (SymbolicExpressionTreeTopLevelNode)grammar.ProgramRootSymbol.CreateTreeNode();
if (rootNode.HasLocalParameters)
{
rootNode.ResetLocalParameters(random);
}
rootNode.SetGrammar(grammar.CreateExpressionTreeGrammar());
var startNode = (SymbolicExpressionTreeTopLevelNode)grammar.StartSymbol.CreateTreeNode();
if (startNode.HasLocalParameters)
{
startNode.ResetLocalParameters(random);
}
startNode.SetGrammar(grammar.CreateExpressionTreeGrammar());
rootNode.AddSubtree(startNode);
double p = random.NextDouble();
if (p < 0.5)
{
GrowTreeCreator.Create(random, startNode, maxTreeDepth - 2);
}
else
{
FullTreeCreator.Create(random, startNode, maxTreeDepth - 2);
}
tree.Root = rootNode;
return(tree);
}
protected FullTreeCreator(FullTreeCreator original, Cloner cloner) : base(original, cloner)
{
}
protected FullTreeCreator(FullTreeCreator original, Cloner cloner) : base(original, cloner) { }