source: trunk/yat/regression/TukeyBiweight.cc @ 2508

Last change on this file since 2508 was 2508, checked in by Peter, 10 years ago

adding a functor calculating Tukey Biweight. refs #666

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1// $Id: TukeyBiweight.cc 2508 2011-07-08 20:56:29Z peter $
2
3/*
4  Copyright (C) 2011 Peter Johansson
5
6  This file is part of the yat library, http://dev.thep.lu.se/yat
7
8  The yat library is free software; you can redistribute it and/or
9  modify it under the terms of the GNU General Public License as
10  published by the Free Software Foundation; either version 3 of the
11  License, or (at your option) any later version.
12
13  The yat library is distributed in the hope that it will be useful,
14  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  General Public License for more details.
17
18  You should have received a copy of the GNU General Public License
19  along with yat. If not, see <http://www.gnu.org/licenses/>.
20*/
21
22#include "TukeyBiweight.h"
23
24namespace theplu {
25namespace yat {
26namespace regression {
27
28  double TukeyBiweight::operator()(const double x) const
29  {
30    if (x>1 || x<-1)
31      return 0.0;
32    double result = 1-x*x;
33    result *= result;
34    return result;
35  }
36
37}}} // of namespaces regression, yat, and theplu
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