1 | //---------------------------------------------------------------------- |
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2 | // File: ANN.cpp |
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3 | // Programmer: Sunil Arya and David Mount |
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4 | // Description: Methods for ANN.h and ANNx.h |
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5 | // Last modified: 01/04/05 (Version 1.0) |
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6 | //---------------------------------------------------------------------- |
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7 | // Copyright (c) 1997-2005 University of Maryland and Sunil Arya and |
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8 | // David Mount. All Rights Reserved. |
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9 | // |
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10 | // This software and related documentation is part of the Approximate |
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11 | // Nearest Neighbor Library (ANN). This software is provided under |
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12 | // the provisions of the Lesser GNU Public License (LGPL). See the |
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13 | // file ../ReadMe.txt for further information. |
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14 | // |
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15 | // The University of Maryland (U.M.) and the authors make no |
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16 | // representations about the suitability or fitness of this software for |
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17 | // any purpose. It is provided "as is" without express or implied |
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18 | // warranty. |
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19 | //---------------------------------------------------------------------- |
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20 | // History: |
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21 | // Revision 0.1 03/04/98 |
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22 | // Initial release |
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23 | // Revision 1.0 04/01/05 |
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24 | // Added performance counting to annDist() |
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25 | //---------------------------------------------------------------------- |
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26 | |
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27 | #include <ANN/ANNx.h> // all ANN includes |
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28 | #include <ANN/ANNperf.h> // ANN performance |
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29 | |
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30 | using namespace std; // make std:: accessible |
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31 | |
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32 | //---------------------------------------------------------------------- |
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33 | // Point methods |
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34 | //---------------------------------------------------------------------- |
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35 | |
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36 | //---------------------------------------------------------------------- |
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37 | // Distance utility. |
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38 | // (Note: In the nearest neighbor search, most distances are |
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39 | // computed using partial distance calculations, not this |
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40 | // procedure.) |
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41 | //---------------------------------------------------------------------- |
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42 | |
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43 | ANNdist annDist( // interpoint squared distance |
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44 | int dim, |
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45 | ANNpoint p, |
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46 | ANNpoint q) |
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47 | { |
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48 | register int d; |
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49 | register ANNcoord diff; |
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50 | register ANNcoord dist; |
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51 | |
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52 | dist = 0; |
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53 | for (d = 0; d < dim; d++) { |
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54 | diff = p[d] - q[d]; |
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55 | dist = ANN_SUM(dist, ANN_POW(diff)); |
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56 | } |
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57 | ANN_FLOP(3*dim) // performance counts |
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58 | ANN_PTS(1) |
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59 | ANN_COORD(dim) |
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60 | return dist; |
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61 | } |
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62 | |
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63 | //---------------------------------------------------------------------- |
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64 | // annPrintPoint() prints a point to a given output stream. |
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65 | //---------------------------------------------------------------------- |
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66 | |
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67 | void annPrintPt( // print a point |
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68 | ANNpoint pt, // the point |
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69 | int dim, // the dimension |
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70 | std::ostream &out) // output stream |
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71 | { |
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72 | for (int j = 0; j < dim; j++) { |
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73 | out << pt[j]; |
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74 | if (j < dim-1) out << " "; |
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75 | } |
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76 | } |
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77 | |
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78 | //---------------------------------------------------------------------- |
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79 | // Point allocation/deallocation: |
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80 | // |
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81 | // Because points (somewhat like strings in C) are stored |
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82 | // as pointers. Consequently, creating and destroying |
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83 | // copies of points may require storage allocation. These |
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84 | // procedures do this. |
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85 | // |
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86 | // annAllocPt() and annDeallocPt() allocate a deallocate |
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87 | // storage for a single point, and return a pointer to it. |
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88 | // |
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89 | // annAllocPts() allocates an array of points as well a place |
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90 | // to store their coordinates, and initializes the points to |
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91 | // point to their respective coordinates. It allocates point |
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92 | // storage in a contiguous block large enough to store all the |
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93 | // points. It performs no initialization. |
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94 | // |
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95 | // annDeallocPts() should only be used on point arrays allocated |
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96 | // by annAllocPts since it assumes that points are allocated in |
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97 | // a block. |
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98 | // |
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99 | // annCopyPt() copies a point taking care to allocate storage |
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100 | // for the new point. |
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101 | // |
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102 | // annAssignRect() assigns the coordinates of one rectangle to |
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103 | // another. The two rectangles must have the same dimension |
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104 | // (and it is not possible to test this here). |
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105 | //---------------------------------------------------------------------- |
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106 | |
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107 | ANNpoint annAllocPt(int dim, ANNcoord c) // allocate 1 point |
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108 | { |
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109 | ANNpoint p = new ANNcoord[dim]; |
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110 | for (int i = 0; i < dim; i++) p[i] = c; |
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111 | return p; |
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112 | } |
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113 | |
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114 | ANNpointArray annAllocPts(int n, int dim) // allocate n pts in dim |
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115 | { |
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116 | ANNpointArray pa = new ANNpoint[n]; // allocate points |
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117 | ANNpoint p = new ANNcoord[n*dim]; // allocate space for coords |
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118 | for (int i = 0; i < n; i++) { |
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119 | pa[i] = &(p[i*dim]); |
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120 | } |
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121 | return pa; |
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122 | } |
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123 | |
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124 | void annDeallocPt(ANNpoint &p) // deallocate 1 point |
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125 | { |
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126 | delete [] p; |
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127 | p = NULL; |
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128 | } |
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129 | |
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130 | void annDeallocPts(ANNpointArray &pa) // deallocate points |
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131 | { |
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132 | delete [] pa[0]; // dealloc coordinate storage |
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133 | delete [] pa; // dealloc points |
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134 | pa = NULL; |
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135 | } |
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136 | |
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137 | ANNpoint annCopyPt(int dim, ANNpoint source) // copy point |
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138 | { |
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139 | ANNpoint p = new ANNcoord[dim]; |
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140 | for (int i = 0; i < dim; i++) p[i] = source[i]; |
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141 | return p; |
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142 | } |
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143 | |
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144 | // assign one rect to another |
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145 | void annAssignRect(int dim, ANNorthRect &dest, const ANNorthRect &source) |
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146 | { |
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147 | for (int i = 0; i < dim; i++) { |
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148 | dest.lo[i] = source.lo[i]; |
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149 | dest.hi[i] = source.hi[i]; |
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150 | } |
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151 | } |
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152 | |
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153 | // is point inside rectangle? |
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154 | ANNbool ANNorthRect::inside(int dim, ANNpoint p) |
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155 | { |
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156 | for (int i = 0; i < dim; i++) { |
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157 | if (p[i] < lo[i] || p[i] > hi[i]) return ANNfalse; |
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158 | } |
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159 | return ANNtrue; |
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160 | } |
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161 | |
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162 | //---------------------------------------------------------------------- |
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163 | // Error handler |
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164 | //---------------------------------------------------------------------- |
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165 | |
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166 | void annError(char *msg, ANNerr level) |
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167 | { |
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168 | if (level == ANNabort) { |
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169 | cerr << "ANN: ERROR------->" << msg << "<-------------ERROR\n"; |
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170 | exit(1); |
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171 | } |
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172 | else { |
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173 | cerr << "ANN: WARNING----->" << msg << "<-------------WARNING\n"; |
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174 | } |
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175 | } |
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176 | |
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177 | //---------------------------------------------------------------------- |
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178 | // Limit on number of points visited |
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179 | // We have an option for terminating the search early if the |
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180 | // number of points visited exceeds some threshold. If the |
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181 | // threshold is 0 (its default) this means there is no limit |
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182 | // and the algorithm applies its normal termination condition. |
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183 | // This is for applications where there are real time constraints |
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184 | // on the running time of the algorithm. |
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185 | //---------------------------------------------------------------------- |
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186 | |
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187 | int ANNmaxPtsVisited = 0; // maximum number of pts visited |
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188 | int ANNptsVisited; // number of pts visited in search |
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189 | |
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190 | //---------------------------------------------------------------------- |
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191 | // Global function declarations |
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192 | //---------------------------------------------------------------------- |
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193 | |
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194 | void annMaxPtsVisit( // set limit on max. pts to visit in search |
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195 | int maxPts) // the limit |
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196 | { |
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197 | ANNmaxPtsVisited = maxPts; |
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198 | } |
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