/**
* 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 att1 - (int)att1.
*
* @author Ingo Mierswa
*/
public class TriangularFunction extends RegressionFunction {
@Override
public double calculate(double[] args) throws FunctionException {
if (args.length != 1) {
throw new FunctionException("Triangular function", "needs 1 attributes!");
}
// double a = 100.0d;
// double b = 5.0d;
// return a * (4.0d * Math.abs(Math.atan(Math.tan((args[0]/ b + 1.0d
// / 4.0d) * Math.PI)) / Math.PI) - 1.0d);
return args[0] - (int) args[0];
}
@Override
public int getMinNumberOfAttributes() {
return 1;
}
@Override
public int getMaxNumberOfAttributes() {
return 1;
}
}