package fi.javasom.jsom;
/**
 * This is JSomNormalization class that normalizes the input vectors.
 *
 *  Copyright (C) 2001  Tomi Suuronen
 *
 *  @version 1.0
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

import fi.javasom.jsom.*;
import java.io.*; //this line for debugging

public class JSomNormalization
{
	private InputVectors iVector;
	private int dimension; //dimensionality of a node
	private int iSize; //number of input vectors
	private double[] values; //cache for the node values

	/**
	 * Constructor.
	 *
	 * @param InputVectors iVector - input vectors.
	 * @param int dimension - dimensionality of a node.
	*/
	public JSomNormalization(InputVectors iVector,int dimension)
	{
		this.iVector = iVector;
		this.dimension = dimension;
		iSize = iVector.getCount();
	}

	/**
	 * Does the normalization phase.
	 *
	 * @return InputVectors - Returns the normalized input vectors.
	*/
	public InputVectors doNormalization()
	{
		double cache = 0.0;
		//resolve the largest node value
		for(int i=0;i<iSize;i++)
		{
			values = iVector.getNodeValuesAt(i);
			for(int j=0;j<dimension;j++)
			{
				if(values[j]>cache)
				{
					cache = values[j];
				}
			}
		}
		//normalize if necessary
		if(cache>1)
		{
			for(int i=0;i<iSize;i++)
			{
				values = iVector.getNodeValuesAt(i);
				for(int j=0;j<dimension;j++)
				{
					values[j] = values[j] / cache;
				}
				iVector.setNodeValuesAt(i,values);
			}
		}
		return iVector;
	}
}