public void MutateRandomNode()
{
List <GSTreeNode> nodes = new List <GSTreeNode>();
GSTreeTraverse.GetAllFunctionNodes(root, nodes);
System.Random rand = new System.Random();
GSTreeNode node = nodes[rand.Next(nodes.Count)];
if (GSDictionaries.BasicFunctions.ContainsKey(node.value) ||
GSDictionaries.DoubleArgFunctions.ContainsKey(node.value))
{
node.value = GSDictionaries.GetDifferentDoubleArgFunction(node.value);
}
else if (GSDictionaries.SingleArgFunctions.ContainsKey(node.value))
{
node.value = GSDictionaries.GetDifferentSingleArgFunction(node.value);
}
}