Free cookie consent management tool by TermsFeed Policy Generator

source: branches/3.1/sources/HeuristicLab.Functions/Division.cs @ 4075

Last change on this file since 4075 was 434, checked in by gkronber, 16 years ago

added creation of empty SubOperatorTypeConstraints for each input of each function (#163)

File size: 2.0 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2008 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;
23using System.Collections.Generic;
24using System.Text;
25using HeuristicLab.Core;
26using System.Diagnostics;
27using HeuristicLab.Constraints;
28using System.Linq;
29using HeuristicLab.DataAnalysis;
30
31namespace HeuristicLab.Functions {
32  public sealed class Division : FunctionBase {
33    private const double EPSILON = 10.0E-20; // if any divisor is < EPSILON return 0
34
35    public override string Description {
36      get {
37        return @"Protected division
38Divides the result of the first sub-tree by the results of the following sub-tree.
39In case one of the divisors is 0 returns 0.
40    (/ 3) => 1/3
41    (/ 2 3) => 2/3
42    (/ 3 4 5) => 3/20
43    (/ 2 0 4) => 0
44";
45      }
46    }
47
48    public Division()
49      : base() {
50      // 2 - 3 seems like an reasonable defaut (used for +,-,*,/) (discussion with swinkler and maffenze)
51      AddConstraint(new NumberOfSubOperatorsConstraint(2, 3));
52      AddConstraint(new SubOperatorTypeConstraint(0));
53      AddConstraint(new SubOperatorTypeConstraint(1));
54      AddConstraint(new SubOperatorTypeConstraint(2));
55    }
56
57    public override void Accept(IFunctionVisitor visitor) {
58      visitor.Visit(this);
59    }
60  }
61}
Note: See TracBrowser for help on using the repository browser.