Beispiel #1
0
		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);
		}
Beispiel #2
0
		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);
		}