source: branches/HeuristicLab.Problems.GeneticProgramming.BloodGlucosePrediction/RealGlucoseVariableTreeNode.cs

#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2015 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
 *
 * This file is part of HeuristicLab.
 *
 * HeuristicLab is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * HeuristicLab is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
 */
#endregion

using System;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
using HeuristicLab.Random;

namespace HeuristicLab.Problems.GeneticProgramming.GlucosePrediction {
  [StorableClass]
  public class RealGlucoseVariableTreeNode : SymbolicExpressionTreeTerminalNode {
    public new RealGlucoseVariableSymbol Symbol {
      get { return (RealGlucoseVariableSymbol)base.Symbol; }
    }
    [Storable]
    private int rowOffset;
    public int RowOffset {
      get { return rowOffset; }
      set { rowOffset = value; }
    }

    [Storable]
    private double weight;
    public double Weight {
      get { return weight; }
      set { weight = value; }
    }
    [StorableConstructor]
    protected RealGlucoseVariableTreeNode(bool deserializing) : base(deserializing) { }
    protected RealGlucoseVariableTreeNode(RealGlucoseVariableTreeNode original, Cloner cloner)
      : base(original, cloner) {
      rowOffset = original.rowOffset;
      weight = original.weight;
    }
    protected RealGlucoseVariableTreeNode() { }
    public RealGlucoseVariableTreeNode(RealGlucoseVariableSymbol variableSymbol) : base(variableSymbol) { }

    public override bool HasLocalParameters {
      get { return true; }
    }

    public override void ResetLocalParameters(IRandom random) {
      base.ResetLocalParameters(random);
      rowOffset = random.Next(Symbol.MinRowOffset, Symbol.MaxRowOffset + 1);
      weight = NormalDistributedRandom.NextDouble(random, 0, 10);
    }

    public override void ShakeLocalParameters(IRandom random, double shakingFactor) {
      base.ShakeLocalParameters(random, shakingFactor);

      // increase or decrease offset by one
      rowOffset += random.NextDouble() > 0.5 ? +1 : -1;
      rowOffset = Math.Max(rowOffset, Symbol.MinRowOffset);
      rowOffset = Math.Min(rowOffset, Symbol.MaxRowOffset);
      weight += NormalDistributedRandom.NextDouble(random, 0, 1.0 * shakingFactor);
    }

    public override IDeepCloneable Clone(Cloner cloner) {
      return new RealGlucoseVariableTreeNode(this, cloner);
    }

    public override string ToString() {
      return string.Format("{0:N3} * realGluc(k{1})", weight, rowOffset);
    }
  }
}