static double DeltaRemove(CLOPECluster cluster, List<int> transaction, double r)
{
int squareNew = cluster.Square - transaction.Count;
int widthNew = cluster.Width;
for (int i = 0; i < transaction.Count; i++)
if (cluster.Occ[transaction[i]] == 1)
widthNew--;
return squareNew * (cluster.Size - 1) / Math.Pow(widthNew, r) - cluster.Square * cluster.Size / Math.Pow(cluster.Width, r);
}
static double DeltaAdd(CLOPECluster cluster, List<int> transaction, double r)
{
if (cluster == null)
return transaction.Count / Math.Pow(transaction.Count, r);
int squareNew = cluster.Square + transaction.Count;
int widthNew = cluster.Width;
for (int i = 0; i < transaction.Count; i++)
if (!cluster.Occ.ContainsKey(transaction[i]))
widthNew++;
return squareNew * (cluster.Size + 1) / Math.Pow(widthNew, r) - cluster.Square * cluster.Size / Math.Pow(cluster.Width, r);
}