source: trunk/HeuristicLab.Common/3.3/DoubleExtensions.cs @ 17351

Last change on this file since 17351 was 17351, checked in by chaider, 12 months ago

#3032 Added type information for MethodInfo in SymbolicDataAnalysisExpressionCompiledTreeInterpreter class for the IsAlmost method to fix ambiguous reflection

File size: 2.1 KB
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1#region License Information
2/* HeuristicLab
3 * Copyright (C) Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System;
23namespace HeuristicLab.Common {
24  public static class DoubleExtensions {
25    /// <summary>
26    /// Compares the similarity of value x and value y with a precision of 1.0E-12.
27    /// </summary>
28    /// <param name="x">First double value to be checked</param>
29    /// <param name="y">Second double value to compare with</param>
30    /// <returns>true if the difference is <= 1.0E-12</returns>
31    public static bool IsAlmost(this double x, double y) {
32      var epsilon = 1.0E-12;
33      return IsAlmost(x, y, epsilon);
34    }
35
36    /// <summary>
37    /// Compares the similarity of value x and value y with a given precision (epsilon).
38    /// </summary>
39    /// <param name="x">First double value to be checked</param>
40    /// <param name="y">Second double value to compare with</param>
41    /// <param name="epsilon">Error term to specify the precision</param>
42    /// <returns>true if the difference is <= epsilon</returns>
43    public static bool IsAlmost(this double x, double y, double epsilon) {
44      if (double.IsInfinity(x)) {
45        if (x > 0) return double.IsPositiveInfinity(y);
46        else return double.IsNegativeInfinity(y);
47      } else {
48        return Math.Abs(x - y) < epsilon;
49      }
50    }
51  }
52}
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