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annotate liboctave/Array-d.cc @ 11273:bd2643f0ce57 ss-3-3-54

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snapshot 3.3.54
author John W. Eaton <jwe@octave.org>
date Fri, 19 Nov 2010 16:05:58 -0500
parents 4d1fc073fbb7
children fd0a3ac60b0e
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1 /*
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2
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3 Copyright (C) 1994, 1995, 1996, 1997, 1998, 2000, 2001, 2003, 2004,
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4 2005, 2006, 2007, 2008, 2009 John W. Eaton
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5 Copyright (C) 2009 VZLU Prague
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6
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7 This file is part of Octave.
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8
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9 Octave is free software; you can redistribute it and/or modify it
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10 under the terms of the GNU General Public License as published by the
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11 Free Software Foundation; either version 3 of the License, or (at your
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12 option) any later version.
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13
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14 Octave is distributed in the hope that it will be useful, but WITHOUT
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15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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17 for more details.
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18
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19 You should have received a copy of the GNU General Public License
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20 along with Octave; see the file COPYING. If not, see
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21 <http://www.gnu.org/licenses/>.
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22
b75705dec035 [project @ 1994-10-02 15:19:39 by jwe]
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23 */
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24
2006
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25 #ifdef HAVE_CONFIG_H
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26 #include <config.h>
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27 #endif
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28
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29 // Instantiate Arrays of double values.
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30
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31 #include "lo-mappers.h"
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32 #include "Array.h"
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33 #include "Array.cc"
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34 #include "oct-locbuf.h"
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35
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36 #define INLINE_ASCENDING_SORT
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37 #define INLINE_DESCENDING_SORT
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38 #include "oct-sort.cc"
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39
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40 template <>
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41 inline bool
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42 sort_isnan<double> (double x)
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43 {
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44 return xisnan (x);
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45 }
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46
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47 static bool
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48 nan_ascending_compare (double x, double y)
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49 {
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50 return xisnan (y) ? ! xisnan (x) : x < y;
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51 }
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52
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53 static bool
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54 nan_descending_compare (double x, double y)
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55 {
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56 return xisnan (x) ? ! xisnan (y) : x > y;
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57 }
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58
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59 Array<double>::compare_fcn_type
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60 safe_comparator (sortmode mode, const Array<double>& a , bool allow_chk)
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61 {
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62 Array<double>::compare_fcn_type result = 0;
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63
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64 if (allow_chk)
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65 {
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66 octave_idx_type k = 0;
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67 for (; k < a.numel () && ! xisnan (a(k)); k++) ;
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68 if (k == a.numel ())
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69 {
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70 if (mode == ASCENDING)
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71 result = octave_sort<double>::ascending_compare;
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72 else if (mode == DESCENDING)
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73 result = octave_sort<double>::descending_compare;
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74 }
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75 }
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76
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77 if (! result)
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78 {
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79 if (mode == ASCENDING)
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80 result = nan_ascending_compare;
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81 else if (mode == DESCENDING)
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82 result = nan_descending_compare;
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83 }
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84
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85 return result;
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86 }
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87
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88 // The default solution using NaN-safe comparator is OK, but almost twice as
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89 // slow than this code.
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90 template <>
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91 OCTAVE_API
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92 sortmode
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93 Array<double>::is_sorted (sortmode mode) const
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94 {
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95 octave_idx_type n = numel ();
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96
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97 const double *el = data ();
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98
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99 if (n <= 1)
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100 return mode ? mode : ASCENDING;
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101
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102 if (! mode)
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103 {
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104 // Auto-detect mode.
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105 if (el[n-1] < el[0] || xisnan (el[0]))
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106 mode = DESCENDING;
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107 else
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108 mode = ASCENDING;
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109 }
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110
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111 if (mode == DESCENDING)
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112 {
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113 octave_idx_type j = 0;
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114 double r;
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115 // Sort out NaNs.
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116 do
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117 r = el[j++];
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118 while (xisnan (r) && j < n);
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119
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120 // Orient the test so that NaN will not pass through.
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121 for (; j < n; j++)
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122 {
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123 if (r >= el[j])
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124 r = el[j];
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125 else
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126 {
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127 mode = UNSORTED;
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128 break;
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129 }
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130 }
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131
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132 }
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133 else if (mode == ASCENDING)
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134 {
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135 // Sort out NaNs.
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136 while (n > 0 && xisnan (el[n-1]))
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137 n--;
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138
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139 if (n > 0)
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140 {
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141 // Orient the test so that NaN will not pass through.
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142 double r = el[0];
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143 for (octave_idx_type j = 1; j < n; j++)
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144 {
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145 if (r <= el[j])
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146 r = el[j];
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147 else
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148 {
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149 mode = UNSORTED;
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150 break;
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151 }
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152 }
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153 }
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154 }
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155
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156 return mode;
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157 }
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158
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159 INSTANTIATE_ARRAY_SORT (double);
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160
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161 INSTANTIATE_ARRAY (double, OCTAVE_API);
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162
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163 template OCTAVE_API std::ostream& operator << (std::ostream&, const Array<double>&);
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164
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165 #include "DiagArray2.h"
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166 #include "DiagArray2.cc"
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167
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168 template class OCTAVE_API DiagArray2<double>;