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A library of composable components enabling simpler Computational Intelligence

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/**           __  __
 *    _____ _/ /_/ /_    Computational Intelligence Library (CIlib)
 *   / ___/ / / / __ \   (c) CIRG @ UP
 *  / /__/ / / / /_/ /   http://cilib.net
 *  \___/_/_/_/_.___/
 */
package net.sourceforge.cilib.functions.continuous.unconstrained;

import net.sourceforge.cilib.functions.ContinuousFunction;
import net.sourceforge.cilib.type.types.Numeric;
import net.sourceforge.cilib.type.types.container.Vector;

/**
 * The Alpine Function.
 *
 * Reference: S. Rahnamayan, H. R. Tizhoosh, M. M. A. Salama A novel population initialisation method for accelerating evolutionary algorithms,
 * Computers and Mathematics with Applications, 2007
 *
 * Minimum:
 * 

 *  ƒ(x*) = 0
 *  x* = (0, 0, ...., 0)
 *  for x_i in [-10, 10]
 * 
 * 
 *
 * Characteristics:
 * 

 * 
 * 
 *
 * R(-10, 10)^30
 *
 */
public class Alpine extends ContinuousFunction {

    private static final long serialVersionUID = -1365268075451075465L;

    /**
     * {@inheritDoc}
     */
    @Override
    public Double f(Vector x) {
        double sum = 0;
        for (Numeric n : x) {
            sum += Math.abs((n.doubleValue() * Math.sin(n.doubleValue())) + (0.1 * n.doubleValue()));
        }
        return sum;
    }
}