/*
 * NMApplet.java
 * Created on Mar 27, 2005
 */
package search;

/**
 * A type.
 */
public final class NMMain {
    
    private static final Function NMMFun = new NMMFunction();
    
    private static final double dev = 1.0 / Math.sqrt(2);
    private static final Point[] initialSimplex = {
         new Point(new double[]{-10.0, -10.0}),
         new Point(new double[]{ -9.0, -10.0}),
         new Point(new double[]{-10.0,  -9.0})};
    
    public static void main(String args[])	 {
        NelderMead nm = new NelderMead(NMMFun, initialSimplex);
        Point minP = nm.search();
        double min = NMMFun.at(minP);
        System.out.println(minP + " = " + min);
    }
    
    private static class NMMFunction implements Function {
        
        public double at(Point p) {
            final double x = p.get(1), y = p.get(2);
            return 0.2 * (sq(x) + sq(y)) -
     	   		   2 * Math.exp(-(sq(x) + sq(y))) -
     	   		   Math.exp(-0.5 * (sq(x) + sq(y + 4)));
        }
 
        private static double sq(double a) { return a * a; };      
    }

}