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annotate liboctave/Array-f.cc @ 14685:4460c4fb20e6 stable rc-3-6-2-2

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3.6.2-rc2 release candidate * configure.ac (AC_INIT): Version is now 3.6.2-rc2.
author John W. Eaton <jwe@octave.org>
date Thu, 24 May 2012 15:35:50 -0400
parents 72c96de7a403
children
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1 /*
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2
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3 Copyright (C) 1994-2012 John W. Eaton
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4 Copyright (C) 2009 VZLU Prague
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5
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6 This file is part of Octave.
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7
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8 Octave is free software; you can redistribute it and/or modify it
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9 under the terms of the GNU General Public License as published by the
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10 Free Software Foundation; either version 3 of the License, or (at your
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11 option) any later version.
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12
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13 Octave is distributed in the hope that it will be useful, but WITHOUT
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 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 Octave; see the file COPYING. If not, see
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20 <http://www.gnu.org/licenses/>.
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21
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22 */
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23
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24 #ifdef HAVE_CONFIG_H
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25 #include <config.h>
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26 #endif
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27
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28 // Instantiate Arrays of float values.
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29
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30 #include "lo-mappers.h"
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31 #include "Array.h"
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32 #include "Array.cc"
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33 #include "oct-locbuf.h"
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34
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35 #define INLINE_ASCENDING_SORT
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36 #define INLINE_DESCENDING_SORT
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37 #include "oct-sort.cc"
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38
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39 template <>
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40 inline bool
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41 sort_isnan<float> (float x)
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42 {
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43 return xisnan (x);
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44 }
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45
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46 static bool
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47 nan_ascending_compare (float x, float y)
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48 {
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49 return xisnan (y) ? ! xisnan (x) : x < y;
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50 }
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51
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52 static bool
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53 nan_descending_compare (float x, float y)
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54 {
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55 return xisnan (x) ? ! xisnan (y) : x > y;
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56 }
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57
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58 Array<float>::compare_fcn_type
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59 safe_comparator (sortmode mode, const Array<float>& a , bool allow_chk)
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60 {
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61 Array<float>::compare_fcn_type result = 0;
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62
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63 if (allow_chk)
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64 {
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65 octave_idx_type k = 0;
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66 for (; k < a.numel () && ! xisnan (a(k)); k++) ;
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67 if (k == a.numel ())
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68 {
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69 if (mode == ASCENDING)
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70 result = octave_sort<float>::ascending_compare;
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71 else if (mode == DESCENDING)
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72 result = octave_sort<float>::descending_compare;
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73 }
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74 }
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75
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76 if (! result)
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77 {
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78 if (mode == ASCENDING)
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79 result = nan_ascending_compare;
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80 else if (mode == DESCENDING)
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81 result = nan_descending_compare;
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82 }
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83
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84 return result;
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85 }
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86
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87 // The default solution using NaN-safe comparator is OK, but almost twice as
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88 // slow than this code.
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89 template <>
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90 OCTAVE_API
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91 sortmode
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92 Array<float>::is_sorted (sortmode mode) const
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93 {
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94 octave_idx_type n = numel ();
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95
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96 const float *el = data ();
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97
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98 if (n <= 1)
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99 return mode ? mode : ASCENDING;
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100
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101 if (! mode)
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102 {
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103 // Auto-detect mode.
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104 if (el[n-1] < el[0] || xisnan (el[0]))
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105 mode = DESCENDING;
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106 else
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107 mode = ASCENDING;
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108 }
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109
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110 if (mode == DESCENDING)
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111 {
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112 octave_idx_type j = 0;
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113 float r;
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114 // Sort out NaNs.
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115 do
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116 r = el[j++];
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117 while (xisnan (r) && j < n);
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118
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119 // Orient the test so that NaN will not pass through.
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120 for (; j < n; j++)
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121 {
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122 if (r >= el[j])
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123 r = el[j];
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124 else
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125 {
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126 mode = UNSORTED;
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127 break;
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128 }
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129 }
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130
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131 }
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132 else if (mode == ASCENDING)
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133 {
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134 // Sort out NaNs.
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135 while (n > 0 && xisnan (el[n-1]))
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136 n--;
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137
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138 if (n > 0)
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139 {
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140 // Orient the test so that NaN will not pass through.
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141 float r = el[0];
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142 for (octave_idx_type j = 1; j < n; j++)
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143 {
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144 if (r <= el[j])
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145 r = el[j];
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146 else
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147 {
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148 mode = UNSORTED;
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149 break;
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150 }
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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 return mode;
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156 }
3a8327d51ed4 optimize issorted for doubles & floats
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157
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158 INSTANTIATE_ARRAY_SORT (float);
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159
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e9cb742df9eb imported patch sort3.diff
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160 INSTANTIATE_ARRAY (float, OCTAVE_API);
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161
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162 template OCTAVE_API std::ostream& operator << (std::ostream&, const Array<float>&);
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163
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164 #include "DiagArray2.h"
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165 #include "DiagArray2.cc"
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166
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167 template class OCTAVE_API DiagArray2<float>;