[3150] | 1 | #region License Information
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| 2 | /* HeuristicLab
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[3154] | 3 | * Copyright (C) 2002-2010 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[3150] | 4 | *
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| 5 | * This file is part of HeuristicLab.
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| 6 | *
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| 7 | * HeuristicLab is free software: you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation, either version 3 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * HeuristicLab is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 | #endregion
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| 21 |
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| 22 | using System;
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[3154] | 23 | using HeuristicLab.Core;
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| 24 | using HeuristicLab.Data;
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| 25 | using HeuristicLab.Encodings.RealVectorEncoding;
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| 26 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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[3150] | 27 |
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[3154] | 28 | namespace HeuristicLab.Problems.TestFunctions.SingleObjective {
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[3150] | 29 | /// <summary>
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| 30 | /// Zakharov Function<br/>
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| 31 | /// Domain: [-5.0 , 10.0]^n<br/>
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| 32 | /// Optimum: 0.0 at (0.0, 0.0, ..., 0.0)
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| 33 | /// </summary>
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[3154] | 34 | [Item("ZakharovEvaluator", "Evaluates the Zakharov function on a given point. The optimum of this function is 0 at the origin.")]
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| 35 | [StorableClass]
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| 36 | public class ZakharovEvaluator : SingleObjectiveTestFunctionEvaluator {
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| 37 | /// <summary>
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| 38 | /// Returns false as the Ackley function is a minimization problem.
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| 39 | /// </summary>
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| 40 | public override bool Maximization {
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| 41 | get { return false; }
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[3150] | 42 | }
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[3154] | 43 | /// <summary>
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| 44 | /// Gets the optimum function value (0).
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| 45 | /// </summary>
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| 46 | public override double BestKnownQuality {
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| 47 | get { return 0; }
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| 48 | }
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| 49 | /// <summary>
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| 50 | /// Gets the lower and upper bound of the function.
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| 51 | /// </summary>
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| 52 | public override DoubleMatrix Bounds {
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| 53 | get { return new DoubleMatrix(new double[,] { { -5, 10 } }); }
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| 54 | }
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| 55 | /// <summary>
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| 56 | /// Gets the minimum problem size (1).
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| 57 | /// </summary>
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| 58 | public override int MinimumProblemSize {
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| 59 | get { return 1; }
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| 60 | }
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| 61 | /// <summary>
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| 62 | /// Gets the (theoretical) maximum problem size (2^31 - 1).
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| 63 | /// </summary>
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| 64 | public override int MaximumProblemSize {
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| 65 | get { return int.MaxValue; }
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| 66 | }
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[3150] | 67 |
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| 68 | /// <summary>
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| 69 | /// Evaluates the test function for a specific <paramref name="point"/>.
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| 70 | /// </summary>
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| 71 | /// <param name="point">N-dimensional point for which the test function should be evaluated.</param>
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| 72 | /// <returns>The result value of the Zakharov function at the given point.</returns>
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[3154] | 73 | public static double Apply(RealVector point) {
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[3150] | 74 | int length = point.Length;
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| 75 | double s1 = 0;
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| 76 | double s2 = 0;
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| 77 |
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| 78 | for (int i = 0; i < length; i++) {
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| 79 | s1 = s1 + point[i] * point[i];
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| 80 | s2 = s2 + 0.5 * i * point[i];
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| 81 | }
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| 82 | return s1 + s2 * s2 + s2 * s2 * s2 * s2;
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| 83 | }
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| 84 |
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| 85 | /// <summary>
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| 86 | /// Evaluates the test function for a specific <paramref name="point"/>.
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| 87 | /// </summary>
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| 88 | /// <remarks>Calls <see cref="Apply"/>.</remarks>
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| 89 | /// <param name="point">N-dimensional point for which the test function should be evaluated.</param>
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| 90 | /// <returns>The result value of the Zakharov function at the given point.</returns>
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[3154] | 91 | protected override double EvaluateFunction(RealVector point) {
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[3150] | 92 | return Apply(point);
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| 93 | }
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| 94 | }
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| 95 | }
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