com.barrybecker4.optimization.parameter.redistribution.RedistributionFunction Maven / Gradle / Ivy

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/** Copyright by Barry G. Becker, 2000-2011. Licensed under MIT License: http://www.opensource.org/licenses/MIT  */
package com.barrybecker4.optimization.parameter.redistribution;

import com.barrybecker4.common.math.function.Function;

/**
 * Responsible for defining the probability distribution for selecting random parameter values.
 * Derived classes will define the different sorts of redistribution functions.
 *
 * @author Barry Becker
 */
public interface RedistributionFunction extends Function {

    /**
     * Given an x value, returns f(x)   (i.e. y)
     * Remaps values in the range [0, 1] -> [0, 1]
     * @param value value to remap.
     * @return the remapped value.
     */
    @Override
    double getValue(double value);

    /**
     * Given a y value (i.e. f(x)) return the corresponding x value.
     * Inverse of the above.
     * @param value y value to get inverse of
     * @return x for specified y
     */
    double getInverseFunctionValue(double value);

}