# source:trunk/yat/regression/TukeyBiweight.h@2508

Last change on this file since 2508 was 2508, checked in by Peter, 12 years ago

adding a functor calculating Tukey Biweight. refs #666

• Property svn:eol-style set to `native`
• Property svn:keywords set to `Id`
File size: 1.2 KB
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1#ifndef _theplu_yat_regression_tukey_biweight_
2#define _theplu_yat_regression_tukey_biweight_
3
4// \$Id: TukeyBiweight.h 2508 2011-07-08 20:56:29Z peter \$
5
6/*
7  Copyright (C) 2011 Peter Johansson
8
9  This file is part of the yat library, http://dev.thep.lu.se/yat
10
11  The yat library is free software; you can redistribute it and/or
12  modify it under the terms of the GNU General Public License as
13  published by the Free Software Foundation; either version 3 of the
14  License, or (at your option) any later version.
15
16  The yat library is distributed in the hope that it will be useful,
17  but WITHOUT ANY WARRANTY; without even the implied warranty of
18  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19  General Public License for more details.
20
21  You should have received a copy of the GNU General Public License
22  along with yat. If not, see <http://www.gnu.org/licenses/>.
23*/
24
25#include "Kernel.h"
26
27namespace theplu {
28namespace yat {
29namespace regression {
30
31  /**
32     Functor returning \f\$ (1-x^2)^2 \f\$ if |x|<1 and 0 otherwise.
33   */
34  class TukeyBiweight : public Kernel
35  {
36  public:
37    /**
38       \return \f\$ (1-x^2)^2 \f\$ if |x|<1 and 0 otherwise.
39     */
40    double operator()(const double x) const;
41  };
42
43}}} // of namespaces regression, yat, and theplu
44
45#endif
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