com.barrybecker4.optimization.optimizee.optimizees.TrivialProblem 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.optimizee.optimizees;

import com.barrybecker4.optimization.parameter.NumericParameterArray;
import com.barrybecker4.optimization.parameter.ParameterArray;

/**
 * A trivial one dimensional example implementation of an {@code OptimizeeProblem}
 * @author Barry Becker
 */
public class TrivialProblem extends OptimizeeProblem {

    public static final double SOLUTION_VALUE = 0.4;

    private final ParameterArray EXACT_SOLUTION =  new NumericParameterArray(
                new double[] {SOLUTION_VALUE},
                new double[] {0.0},
                new double[] {1.0},
            new String[] {"param1"});

    @Override
    public ParameterArray getExactSolution() {
        return EXACT_SOLUTION;
    }

    @Override
    public ParameterArray getInitialGuess() {
        return new NumericParameterArray(
                new double[] {0.5},
                new double[] {0.0},
                new double[] {1.0},
                new String[] {"param1"});
    }

    @Override
    public double getFitnessRange() {
        return 1.0;
    }

    @Override
    public String getName() {
        return "Trivial Test Problem";
    }

    @Override
    public boolean evaluateByComparison() {
        return false;
    }

    @Override
    public double evaluateFitness(ParameterArray params) {
        return EXACT_SOLUTION.distance(params);
    }
}