/*
* RapidMiner
*
* Copyright (C) 2001-2008 by Rapid-I and the contributors
*
* Complete list of developers available at our web site:
*
* http://rapid-i.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 3*att1*att1*att1 - att1*att1 + 1000 / abs(att1) + 2000 *
* abs(att1).
*
* @author Ingo Mierswa
* @version $Id: OneVariableNonLinearFunction.java,v 1.3 2008/05/09 19:22:51 ingomierswa Exp $
*/
public class OneVariableNonLinearFunction extends RegressionFunction {
public double calculate(double[] att) throws FunctionException {
if (att.length != 1)
throw new FunctionException("One variable non linear", "needs one attribute!");
return 3.0d * att[0] * att[0] * att[0] - att[0] * att[0] + 1000.0d / Math.abs(att[0]) + 2000.0d * Math.abs(att[0]);
}
}