/*
* Transform.java
*
* Copyright (C) 2002-2006 Alexei Drummond and Andrew Rambaut
*
* This file is part of BEAST.
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership and licensing.
*
* BEAST is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* BEAST 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with BEAST; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
package dr.util;
// todo not really used, is it?
/**
* interface for the one-to-one transform of a continuous variable.
* A static member Transform.LOG provides an instance of LogTransform
*
* @author Andrew Rambaut
* @version $Id: Transform.java,v 1.5 2005/05/24 20:26:01 rambaut Exp $
*/
public interface Transform {
/**
* @return the transformed value
*/
double transform(double value);
/**
* @return the inverse transformed value
*/
double inverse(double value);
/**
* @return the transform's name
*/
String getTransformName();
public class LogTransform implements Transform {
private LogTransform() {
}
public double transform(double value) {
return Math.log(value);
}
public double inverse(double value) {
return Math.exp(value);
}
public String getTransformName() {
return "log";
}
}
public static final LogTransform LOG = new LogTransform();
}