// HKY.java
//
// (c) 1999-2000 PAL Development Core Team
//
// This package may be distributed under the
// terms of the GNU General Public License (GPL)


package pal.substmodel;

import pal.misc.*;

import java.io.*;


/**
 * Hasegawa-Kishino-Yano model of nucleotide evolution
 *
 * @version $Id: HKY.java,v 1.4 2000/08/08 22:58:29 alexi Exp $
 *
 * @author Korbinian Strimmer
 */
public class HKY extends NucleotideModel implements Serializable
{
	/**
	 * Constructor 1
	 *
	 * @param kappa transition/transversion rate ratio
	 * @param freq nucleotide frequencies
	 */
	public HKY(double kappa, double[] freq)
	{
		super(freq);
		
		this.kappa = kappa;
		
		makeHKY();
		fromQToR();
		
		showSE = false;
	}
 
	/**
	 * Constructor 2
	 *
	 * @param params parameter list
	 * @param freq nucleotide frequencies
	 */
	public HKY(double[] params, double[] freq)
	{
		this(params[0], freq);
	}

	// Get numerical code describing the model type
	public int getModelID()
	{
		return 2;
	}

  
 	// interface Report
 
	public void report(PrintWriter out)
	{
		out.println("Model of substitution: HKY (Hasegawa et al. 1985)");
		out.print("Transition/transversion rate ratio kappa: ");
		format.displayDecimal(out, kappa, 2);
		if (showSE)
		{
			out.print("  (S.E. ");
			format.displayDecimal(out, kappaSE, 2);
			out.print(")");
		}
		out.println();

		out.println();
		printFrequencies(out);
		printRatios(out);
	}	

	// interface Parameterized

	public int getNumParameters()
	{
		return 1;
	}
	
	public void setParameter(double param, int n)
	{
		kappa = param;
		
		makeHKY();
		fromQToR();
	}

	public double getParameter(int n)
	{
		return kappa;
	}

	public void setParameterSE(double paramSE, int n)
	{
		kappaSE = paramSE;
	
		showSE = true;
	}

	public double getLowerLimit(int n)
	{
		return 0.0001;
	}
	
	public double getUpperLimit(int n)
	{
		return 100.0;
	}
	
	public double getDefaultValue(int n)
	{
		return 4.0;
	}


	//
	// Private stuff
	// 

	private boolean showSE;
	private double kappa, kappaSE;

	// Make HKY model
	private void makeHKY()
	{
		// Q matrix
		rate[0][1] = 1; rate[0][2] = kappa; rate[0][3] = 1;
		rate[1][2] = 1; rate[1][3] = kappa;
		rate[2][3] = 1;
	}
}
