source: branches/DataAnalysis/HeuristicLab.Problems.DataAnalysis.MultiVariate.TimeSeriesPrognosis/3.3/Symbolic/Symbols/DerivativeVariableTreeNode.cs @ 4457

#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2010 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 HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
using System;
using System.Collections.Generic;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Data;
using HeuristicLab.Random;
using HeuristicLab.Problems.DataAnalysis.Symbolic.Symbols;
namespace HeuristicLab.Problems.DataAnalysis.MultiVariate.TimeSeriesPrognosis.Symbolic.Symbols {
  [StorableClass]
  public sealed class DerivativeVariableTreeNode : VariableTreeNode {
    public new DerivativeVariable Symbol {
      get { return (DerivativeVariable)base.Symbol; }
    }
    [Storable]
    private int lag;
    public int Lag {
      get { return lag; }
      set { lag = value; }
    }

    private DerivativeVariableTreeNode() { }

    // copy constructor
    private DerivativeVariableTreeNode(DerivativeVariableTreeNode original)
      : base(original) {
      lag = original.lag;
    }

    public DerivativeVariableTreeNode(DerivativeVariable derivedVariableSymbol) : base(derivedVariableSymbol) { }

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

    public override void ResetLocalParameters(IRandom random) {
      base.ResetLocalParameters(random);
      lag = random.Next(Symbol.MinLag, Symbol.MaxLag + 1);
    }

    public override void ShakeLocalParameters(IRandom random, double shakingFactor) {
      base.ShakeLocalParameters(random, shakingFactor);
      lag = Math.Min(Symbol.MaxLag, Math.Max(Symbol.MinLag, lag + random.Next(-1, 2)));
    }


    public override object Clone() {
      return new DerivativeVariableTreeNode(this);
    }

    public override string ToString() {
      return Weight.ToString("E4") + " d(" + VariableName +
        ")(t" + (lag > 0 ? "+" : "") + lag + ")";
    }
  }
}