1 | // $Id: vector_distance_test.cc 1050 2008-02-07 18:47:34Z peter $ |
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2 | |
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3 | /* |
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4 | Copyright (C) 2007 Peter Johansson, Markus Ringnér |
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5 | |
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6 | This file is part of the yat library, http://trac.thep.lu.se/yat |
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7 | |
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8 | The yat library is free software; you can redistribute it and/or |
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9 | modify it under the terms of the GNU General Public License as |
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10 | published by the Free Software Foundation; either version 2 of the |
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11 | License, or (at your option) any later version. |
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12 | |
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13 | The yat library is distributed in the hope that it will be useful, |
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14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 | General Public License for more details. |
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17 | |
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18 | You should have received a copy of the GNU General Public License |
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19 | along with this program; if not, write to the Free Software |
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20 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
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21 | 02111-1307, USA. |
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22 | */ |
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23 | |
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24 | #include "yat/classifier/DataLookupWeighted1D.h" |
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25 | #include "yat/classifier/MatrixLookupWeighted.h" |
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26 | #include "yat/statistics/euclidean_distance.h" |
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27 | #include "yat/statistics/pearson_distance.h" |
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28 | #include "yat/utility/matrix.h" |
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29 | #include "yat/utility/vector.h" |
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30 | |
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31 | #include <cassert> |
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32 | #include <fstream> |
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33 | #include <iostream> |
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34 | #include <list> |
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35 | #include <vector> |
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36 | |
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37 | |
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38 | using namespace theplu::yat; |
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39 | |
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40 | int main(const int argc,const char* argv[]) |
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41 | |
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42 | { |
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43 | std::ostream* error; |
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44 | if (argc>1 && argv[1]==std::string("-v")) |
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45 | error = &std::cerr; |
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46 | else { |
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47 | error = new std::ofstream("/dev/null"); |
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48 | if (argc>1) |
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49 | std::cout << "distance_test -v : for printing extra information\n"; |
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50 | } |
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51 | *error << "testing distance" << std::endl; |
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52 | bool ok = true; |
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53 | |
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54 | utility::vector a(3,1); |
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55 | a(1) = 2; |
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56 | utility::vector b(3,0); |
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57 | b(2) = 1; |
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58 | |
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59 | double tolerance=1e-4; |
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60 | statistics::EuclideanDistance eucl_dist; |
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61 | double dist=eucl_dist(a.begin(),a.end(),b.begin()); |
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62 | if(fabs(dist-2.23607)>tolerance) { |
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63 | *error << "Error in unweighted Euclidean distance " << std::endl; |
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64 | ok=false; |
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65 | } |
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66 | |
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67 | statistics::PearsonDistance pear_dist; |
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68 | dist=pear_dist(a.begin(),a.end(),b.begin()); |
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69 | if(fabs(dist-1.5)>tolerance) { |
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70 | *error << "Error in unweighted Pearson distance " << std::endl; |
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71 | ok=false; |
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72 | } |
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73 | |
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74 | |
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75 | // Testing weighted versions |
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76 | utility::matrix m(2,3,1); |
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77 | m(0,1)=2; |
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78 | m(1,0)=0; |
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79 | m(1,1)=0; |
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80 | utility::matrix w(2,3,1); |
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81 | w(0,0)=0; |
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82 | classifier::MatrixLookupWeighted mw(m,w); |
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83 | classifier::DataLookupWeighted1D aw(mw,0,true); |
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84 | classifier::DataLookupWeighted1D bw(mw,1,true); |
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85 | |
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86 | dist=eucl_dist(aw.begin(),aw.end(),bw.begin()); |
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87 | |
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88 | if(fabs(dist-sqrt(6))>tolerance) { |
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89 | *error << "Error in weighted Euclidean distance " << std::endl; |
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90 | ok=false; |
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91 | } |
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92 | |
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93 | dist=pear_dist(aw.begin(),aw.end(),bw.begin()); |
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94 | |
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95 | if(fabs(dist-2)>tolerance) { |
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96 | *error << "Error in weighted Pearson distance " << std::endl; |
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97 | ok=false; |
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98 | } |
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99 | |
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100 | |
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101 | // Test with std::vectors |
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102 | std::vector<double> sa(3,1); |
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103 | sa[1] = 2; |
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104 | std::vector<double> sb(3,0); |
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105 | sb[2] = 1; |
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106 | |
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107 | dist=eucl_dist(sa.begin(),sa.end(),sb.begin()); |
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108 | if(fabs(dist-2.23607)>tolerance) { |
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109 | *error << "Error in distance for std::vector " << std::endl; |
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110 | ok=false; |
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111 | } |
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112 | |
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113 | // Test for a std::list and a std::vector |
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114 | std::list<double> la; |
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115 | std::copy(sa.begin(),sa.end(),std::back_inserter<std::list<double> >(la)); |
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116 | dist=eucl_dist(la.begin(),la.end(),sb.begin()); |
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117 | if(fabs(dist-2.23607)>tolerance) { |
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118 | *error << "Error in distance for std::list " << std::endl; |
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119 | ok=false; |
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120 | } |
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121 | |
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122 | if(!ok) { |
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123 | *error << "distance_test failed" << std::endl; |
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124 | } |
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125 | if (error!=&std::cerr) |
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126 | delete error; |
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127 | if (ok) |
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128 | return 0; |
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129 | return -1; |
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130 | } |
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131 | |
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132 | |
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