dbicore.cs

Cluster validation program

using System;
using System.Collections;

namespace ClusterLibrary
{
	/// <summary>
	/// 
	/// </summary>
	public class DBICore
	{
		public DBICore()
		{
		}

		//========================
		// Ri,qt甫 备茄促
		//========================
		public static double Riqt(Set u, int i, int q, int t){
			if ( u.getValueAt(i).IsEmpty() == true ){
				return 0.0;
			}
		
			ArrayList	list	=	new	ArrayList();
			
			int c = u.Count;
			double withinCDi = 0.0;
			double withinCDj = 0.0;
			double dis_ij = 0.0;
			double result_temp = 0.0;
			withinCDi = ClusterLibrary.Utilities.withInClusterD( u.getValueAt(i), q);
			for ( int b = 0; b < c ;b ++ ){
				if ( i == b ){
					continue;
				}
				if ( u.getValueAt(b).IsEmpty() != true ){
					withinCDj = ClusterLibrary.Utilities.withInClusterD( u.getValueAt(b), q);
					dis_ij = ClusterLibrary.Utilities.Distance( u.getValueAt(i), u.getValueAt(b), (double)t );
					result_temp = ( withinCDi + withinCDj ) / dis_ij;
					list.Add( result_temp );
				}
			}
		
			return ClusterLibrary.Utilities.Max(list);
		}
	
	
		//================================
		// Davies-Bouldin Index甫 备茄促
		//================================
		public static double calculateDBI(Set u, int q, int t){
			int c = u.Count;
			double result = 0.0;
		
			for (int i = 0; i < c; i++){
				result += Riqt(u, i, q, t);
			}	

			result = result / c;
		
			return result;
		}
	}


}