simplex.java

模拟退火是一种启发式算法

package org.theblueplanet.annealing;

import org.apache.log4j.Logger;

/**
 *  Holds the vertices of the simplex and the function value at the vertices
 *
 * @author     Charles M間nin
 * @since    October 29, 2001
 * @version    1.0
 */
public class Simplex {
    private double[] vertex;
    private double value;
    private int ndim;
    private Logger logger = Logger.getLogger("org.theblueplanet.annealing");

    /**
     *  Constructor for the Simplex object
     *
     * @param  vertex  The vertices of the simplex
     * @param  value   The function value
     * @param  ndim    The number of dimensions
     */
    public Simplex(double[] vertex, double value, int ndim) {
        this.ndim = ndim;
        this.vertex = new double[ndim + 1];
        for (int ii = 0; ii <= ndim; ii++) {
            this.vertex[ii] = vertex[ii];
        }
        this.value = value;
    }

    /**
     *  Gets the Vertex attribute of the Simplex object
     *
     * @return    The Vertex value
     */
    public double[] getVertex() {
        return vertex;
    }

    /**
     *  Gets the Value attribute of the Simplex object
     *
     * @return    The Value value
     */
    public double getValue() {
        return value;
    }

    /**
     *  Echoes the Simplex Object to the Appender specified
     *
     * @see org.apache.log4j.Logger
     * @see org.apache.log4j.Appender
     */
    public void toScreen() {
        for (int ii = 1; ii <= ndim; ii++) {
            logger.info("vertex[" + ii + "]= " + vertex[ii]);
        }
        logger.info("function value= " + value);
    }

}