/*
* 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.generator;
import com.rapidminer.tools.LogService;
/**
* This class has one numerical input attribute and one output attribute.
* Calculates the signum of the input attribute, i.e. -1 for values smaller
* than 0, 0 for zero, and 1 for values larger than zero.
*
* @author Ingo Mierswa
* @version $Id: AbsoluteValueGenerator.java,v 2.6 2006/03/21 15:35:40
* ingomierswa Exp $
*/
public class SignumGenerator extends SingularNumericalGenerator {
public SignumGenerator() {}
public FeatureGenerator newInstance() {
return new SignumGenerator();
}
public double calculateValue(double value) {
return Math.signum(value);
}
public void setFunction(String name) {
if (!name.equals("sgn"))
LogService.getGlobal().log("Illegal function name '" + name + "' for " + getClass().getName() + ".", LogService.ERROR);
}
public String getFunction() {
return "sgn";
}
}