source:branches/0.4-stable/yat/regression/KernelTriCube.cc@1392

Last change on this file since 1392 was 1392, checked in by Peter, 15 years ago

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• Property svn:keywords set to `Id`
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1// \$Id: KernelTriCube.cc 1392 2008-07-28 19:35:30Z peter \$
2
3/*
4  Copyright (C) 2005 Peter Johansson
5  Copyright (C) 2006 Jari Häkkinen
6  Copyright (C) 2007 Jari Häkkinen, Peter Johansson
7
8  This file is part of the yat library, http://dev.thep.lu.se/yat
9
10  The yat library is free software; you can redistribute it and/or
11  modify it under the terms of the GNU General Public License as
12  published by the Free Software Foundation; either version 2 of the
13  License, or (at your option) any later version.
14
15  The yat library is distributed in the hope that it will be useful,
16  but WITHOUT ANY WARRANTY; without even the implied warranty of
17  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18  General Public License for more details.
19
20  You should have received a copy of the GNU General Public License
21  along with this program; if not, write to the Free Software
22  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
23  02111-1307, USA.
24*/
25
26#include "KernelTriCube.h"
27#include "Kernel.h"
28
29#include <cmath>
30
31namespace theplu {
32namespace yat {
33namespace regression {
34
35  KernelTriCube::KernelTriCube(void)
36    : Kernel()
37  {
38  }
39
40  double KernelTriCube::operator()(const double x) const
41  {
42    if (x>1 || x<-1)
43      return 0.0;
44    else
45      return pow(1-pow(fabs(x),3),3);
46  }
47
48}}} // of namespaces regression, yat, and theplu
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