RightGaussianShape.java

package libai.fuzzy.sets;

import org.w3c.dom.Node;

/**
 * Fuzzy set representing a gaussian function. Opposed to the normal gaussian
 * function, this function is not symmetrical. All values to the right of the
 * mean, will be equivalent to 1.
 *
 * @author kronenthaler
 */
public class RightGaussianShape extends TwoParameterSet {

    public RightGaussianShape(Node xmlNode) {
        load(xmlNode);
    }

    /**
     * Constructor.
     *
     * @param a Mean value of the Gaussian function.
     * @param b Standard deviation (a.k.a. sigma) of the Gaussian function.
     *
     */
    public RightGaussianShape(double a, double b) {
        this.a = a; // mean
        this.b = b; // sigma
    }

    @Override
    public double eval(double x) {
        if (x <= a) {
            return 1;
        }
        return new GaussianShape(a, b).eval(x);
    }
}