source: trunk/sources/HeuristicLab.GP.StructureIdentification/3.3/Evaluators/CoefficientOfDeterminationEvaluator.cs @ 2042

#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2008 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 System.Collections.Generic;
using System.Linq;
using System.Text;
using HeuristicLab.Core;
using HeuristicLab.Data;
using HeuristicLab.Operators;
using HeuristicLab.Modeling;

namespace HeuristicLab.GP.StructureIdentification {
  public class CoefficientOfDeterminationEvaluator : SimpleGPEvaluatorBase {

    public override string OutputVariableName {
      get {
        return "R2";
      }
    }
    
    public override string Description {
      get {
        return @"Evaluates 'FunctionTree' for all samples of 'Dataset' and calculates
the 'coefficient of determination' of estimated values vs. real values of 'TargetVariable'.";
      }
    }

    public override double Evaluate(double[,] values) {

      double quality = SimpleR2Evaluator.Calculate(values);
      if (double.IsNaN(quality) || double.IsInfinity(quality))
        quality = double.MaxValue;

      return quality;
    }
  }
}