/**
* Copyright (C) 2001-2017 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 10 * sin(3 * att1) + 12 * sin(7 * att1) + 11 * sin(5 * att2) + 9 * sin(10 * att2) +
* 10 * sin(8 * (att1 + att2)).
*
* @author Ingo Mierswa
*/
public class SinusFrequencyFunction extends RegressionFunction {
@Override
public double calculate(double[] att) throws FunctionException {
if (att.length < 2) {
throw new FunctionException("Sinus frequency function", "needs at least 2 attributes!");
}
return 10 * Math.sin(3 * att[0]) + 12 * Math.sin(7 * att[0]) + 11 * Math.sin(5 * att[1]) + 9 * Math.sin(10 * att[1])
+ 10 * Math.sin(8 * (att[0] + att[1]));
}
@Override
public int getMinNumberOfAttributes() {
return 2;
}
}