/*
* 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.
* Depending on the mode specified in the constructor the result will be the
* sinus, cosinus, tangens, arc sinus, arc cosinus, or arc tangens.
*
* @author Ingo Mierswa
* @version $Id: TrigonometricFunctionGenerator.java,v 2.11 2006/03/21 15:35:40
* ingomierswa Exp $
*/
public class TrigonometricFunctionGenerator extends SingularNumericalGenerator {
public static final int SINUS = 0;
public static final int COSINUS = 1;
public static final int TANGENS = 2;
public static final int ARC_TANGENS = 3;
private static final String[] FUNCTION_NAMES = { "sin", "cos", "tan", "atan" };
private int mode = SINUS;
public TrigonometricFunctionGenerator(int mode) {
this.mode = mode;
}
public TrigonometricFunctionGenerator() {}
public FeatureGenerator newInstance() {
return new TrigonometricFunctionGenerator(mode);
}
public double calculateValue(double value) {
double r = 0;
switch (mode) {
case SINUS:
r = Math.sin(value);
break;
case COSINUS:
r = Math.cos(value);
break;
case TANGENS:
r = Math.tan(value);
break;
case ARC_TANGENS:
r = Math.atan(value);
break;
}
return r;
}
public void setFunction(String name) {
for (int i = 0; i < FUNCTION_NAMES.length; i++) {
if (FUNCTION_NAMES[i].equals(name)) {
this.mode = i;
return;
}
}
LogService.getGlobal().log("Illegal function name '" + name + "' for " + getClass().getName() + ".", LogService.ERROR);
}
public String getFunction() {
return FUNCTION_NAMES[mode];
}
public boolean equals(Object o) {
return (super.equals(o) && (this.mode == ((TrigonometricFunctionGenerator) o).mode));
}
public int hashCode() {
return super.hashCode() ^ Integer.valueOf(mode).hashCode();
}
}