1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2016 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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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 |
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23 | using System;
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24 | using System.Collections.Generic;
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25 | using System.Linq;
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26 | using HeuristicLab.Common;
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27 | using HeuristicLab.Core;
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28 | using HeuristicLab.Data;
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29 | using HeuristicLab.Parameters;
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30 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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31 |
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32 | namespace HeuristicLab.Problems.DataAnalysis {
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33 | [StorableClass]
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34 | [Item("Linear Transformation", "f(x) = k * x + d | Represents a linear transformation with multiplication and addition.")]
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35 | public class LinearTransformation : Transformation<double> {
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36 | protected const string MultiplierParameterName = "Multiplier";
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37 | protected const string AddendParameterName = "Addend";
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38 |
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39 | #region Parameters
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40 | public IValueParameter<DoubleValue> MultiplierParameter {
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41 | get { return (IValueParameter<DoubleValue>)Parameters[MultiplierParameterName]; }
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42 | }
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43 | public IValueParameter<DoubleValue> AddendParameter {
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44 | get { return (IValueParameter<DoubleValue>)Parameters[AddendParameterName]; }
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45 | }
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46 | #endregion
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47 |
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48 | #region properties
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49 | public override string ShortName {
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50 | get { return "Lin"; }
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51 | }
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52 | public double Multiplier {
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53 | get { return MultiplierParameter.Value.Value; }
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54 | set {
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55 | MultiplierParameter.Value.Value = value;
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56 | }
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57 | }
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58 |
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59 | public double Addend {
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60 | get { return AddendParameter.Value.Value; }
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61 | set {
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62 | AddendParameter.Value.Value = value;
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63 | }
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64 | }
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65 | #endregion
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66 |
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67 | [StorableConstructor]
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68 | protected LinearTransformation(bool deserializing) : base(deserializing) { }
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69 | protected LinearTransformation(LinearTransformation original, Cloner cloner)
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70 | : base(original, cloner) {
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71 | }
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72 | public LinearTransformation(IEnumerable<string> allowedColumns)
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73 | : base(allowedColumns) {
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74 | Parameters.Add(new ValueParameter<DoubleValue>(MultiplierParameterName, "k | Multiplier for linear transformation", new DoubleValue(1.0)));
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75 | Parameters.Add(new ValueParameter<DoubleValue>(AddendParameterName, "d | Addend for linear transformation", new DoubleValue(0.0)));
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76 | }
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77 |
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78 | public override IDeepCloneable Clone(Cloner cloner) {
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79 | return new LinearTransformation(this, cloner);
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80 | }
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81 |
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82 | public override IEnumerable<double> Apply(IEnumerable<double> data) {
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83 | var m = Multiplier;
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84 | var a = Addend;
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85 | return data.Select(e => e * m + a);
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86 | }
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87 |
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88 | public override bool Check(IEnumerable<double> data, out string errorMsg) {
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89 | errorMsg = null;
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90 | if (Multiplier.IsAlmost(0.0)) {
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91 | errorMsg = String.Format("Multiplicand is 0, all {0} entries will be set to {1}. Inverse apply will not be possible (division by 0).", data.Count(), Addend);
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92 | return false;
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93 | }
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94 | return true;
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95 | }
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96 | }
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97 | }
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