VectorLengthSummarization.java

/*******************************************************************************
 *  Copyright 2007, 2009 Jorge Villalon (jorge.villalon@uai.cl)
 *  
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License. 
 *  You may obtain a copy of the License at 
 *  
 *  	http://www.apache.org/licenses/LICENSE-2.0 
 *  	
 *  Unless required by applicable law or agreed to in writing, software 
 *  distributed under the License is distributed on an "AS IS" BASIS, 
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
 *  See the License for the specific language governing permissions and 
 *  limitations under the License.
 *******************************************************************************/
package tml.vectorspace.operations.summarization;

import Jama.Matrix;

public class VectorLengthSummarization extends AbstractSummarizationOperation {

	public VectorLengthSummarization() {
		this.name = "VectLength";
	}
	
	@Override
	protected double calculatePassageLoading(int doc) {
		Matrix termDoc = this.corpus.getTermDocMatrix();
		double total = 0;
		for(int term = 0; term < termDoc.getRowDimension(); term++) {
			total += Math.pow(termDoc.get(term, doc),2);
		}
		return Math.sqrt(total);
	}

	@Override
	protected double calculateTermLoading(int term) {
		Matrix termDoc = this.corpus.getTermDocMatrix();
		double total = 0;
		for(int doc = 0; doc < termDoc.getRowDimension(); doc++) {
			total += Math.pow(termDoc.get(term, doc),2);
		}
		return Math.sqrt(total);
	}

}