source: trunk/yat/classifier/PolynomialKernelFunction.cc @ 680

Last change on this file since 680 was 680, checked in by Jari Häkkinen, 15 years ago

Addresses #153. Introduced yat namespace. Removed alignment namespace. Clean up of code.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date ID
File size: 2.0 KB
Line 
1// $Id$
2
3/*
4  Copyright (C) The authors contributing to this file.
5
6  This file is part of the yat library, http://lev.thep.lu.se/trac/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 2 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 this program; if not, write to the Free Software
20  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
21  02111-1307, USA.
22*/
23
24#include "PolynomialKernelFunction.h"
25#include "DataLookup1D.h"
26#include "DataLookupWeighted1D.h"
27#include "yat/statistics/AveragerPairWeighted.h"
28
29#include <cmath>
30
31namespace theplu {
32namespace yat {
33namespace classifier { 
34
35PolynomialKernelFunction::PolynomialKernelFunction(int order) 
36  : KernelFunction(), order_(order)
37{
38}
39
40
41double PolynomialKernelFunction::operator()(const DataLookup1D& x,
42                                            const DataLookup1D& y) const   
43{ 
44  assert(x.size()==y.size());
45  return ((order_>1) ? pow(1+x*y,order_) : x*y); 
46}
47
48
49double PolynomialKernelFunction::operator()(const DataLookup1D& x,
50                                            const DataLookupWeighted1D& y) const
51{ 
52  assert(x.size()==y.size());
53  statistics::AveragerPairWeighted averager;
54  averager.add(x,y);
55  if(order_>1) 
56    return pow(1+averager.sum_xy(),order_);
57  return averager.sum_xy();
58}
59
60
61double PolynomialKernelFunction::operator()(const DataLookupWeighted1D& x,
62                                            const DataLookupWeighted1D& y) const
63{ 
64  assert(x.size()==y.size());
65  statistics::AveragerPairWeighted averager;
66  averager.add(x,y);
67  if(order_>1) 
68    return pow(1+averager.sum_xy(),order_);
69  return averager.sum_xy();
70}
71
72
73}}} // of namespace cpptools, yat, and theplu
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