/*
* RapidMiner
*
* Copyright (C) 2001-2011 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.tools.math.function.window;
/**
* A Blackman window function.
*
* @author Tobias Malbrecht, Ingo Mierswa
*/
public class BlackmanWindowFunction extends WindowFunction {
public BlackmanWindowFunction(Integer width) {
super(width);
}
public BlackmanWindowFunction(Integer width, Integer justification) {
super(width, justification);
}
@Override
protected double getValue(int width, int n) {
return 0.42 - 0.5 * Math.cos(2 * Math.PI * n / width) + 0.08 * Math.cos(4 * Math.PI * n / width);
}
}