PolynomialClassificationFunction.java

/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2014 by RapidMiner and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapidminer.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package com.rapidminer.operator.generator;

/**
 * The label is positive if (att1*att1*att1 + att2*att2 - att3*att3 + att4) >
 * 0.
 * 
 * @author Ingo Mierswa
 */
public class PolynomialClassificationFunction extends ClassificationFunction {

	public double calculate(double[] att) throws FunctionException {
		if (att.length < getMinNumberOfAttributes())
			throw new FunctionException("Polynomial classification function", "needs at least 4 attributes!");
		if ((att[0] * att[0] * att[0] + att[1] * att[1] - att[2] * att[2] + att[3]) > 0)
			return getLabel().getMapping().mapString("positive");
		else
			return getLabel().getMapping().mapString("negative");
	}

	@Override
	public int getMinNumberOfAttributes() {
		return 4;
	}
}