Mercurial > octave
annotate libinterp/corefcn/lookup.cc @ 18100:6a71e5030df5
Follow coding convention of defining and initializing only 1 variable per line in liboctinterp.
* libinterp/corefcn/balance.cc, libinterp/corefcn/bsxfun.cc,
libinterp/corefcn/cellfun.cc, libinterp/corefcn/data.cc,
libinterp/corefcn/dlmread.cc, libinterp/corefcn/dot.cc,
libinterp/corefcn/eig.cc, libinterp/corefcn/find.cc, libinterp/corefcn/gcd.cc,
libinterp/corefcn/gl-render.cc, libinterp/corefcn/gl2ps-renderer.cc,
libinterp/corefcn/graphics.cc, libinterp/corefcn/kron.cc,
libinterp/corefcn/load-save.cc, libinterp/corefcn/lookup.cc,
libinterp/corefcn/ls-hdf5.cc, libinterp/corefcn/ls-mat5.cc,
libinterp/corefcn/lu.cc, libinterp/corefcn/max.cc,
libinterp/corefcn/oct-map.cc, libinterp/corefcn/oct-obj.cc,
libinterp/corefcn/oct-stream.cc, libinterp/corefcn/sparse.cc,
libinterp/corefcn/sqrtm.cc, libinterp/corefcn/str2double.cc,
libinterp/corefcn/strfind.cc, libinterp/corefcn/strfns.cc,
libinterp/corefcn/tril.cc, libinterp/corefcn/txt-eng-ft.cc,
libinterp/corefcn/variables.cc, libinterp/corefcn/xdiv.cc,
libinterp/dldfcn/__delaunayn__.cc, libinterp/dldfcn/qr.cc,
libinterp/dldfcn/symrcm.cc, libinterp/dldfcn/tsearch.cc,
libinterp/octave-value/ov-base-diag.cc, libinterp/octave-value/ov-base-int.cc,
libinterp/octave-value/ov-base-mat.cc, libinterp/octave-value/ov-bool-mat.cc,
libinterp/octave-value/ov-bool-sparse.cc, libinterp/octave-value/ov-bool.cc,
libinterp/octave-value/ov-cell.cc, libinterp/octave-value/ov-class.cc,
libinterp/octave-value/ov-complex.cc, libinterp/octave-value/ov-cx-diag.cc,
libinterp/octave-value/ov-cx-mat.cc, libinterp/octave-value/ov-cx-sparse.cc,
libinterp/octave-value/ov-fcn-handle.cc,
libinterp/octave-value/ov-fcn-inline.cc, libinterp/octave-value/ov-float.cc,
libinterp/octave-value/ov-flt-complex.cc,
libinterp/octave-value/ov-flt-cx-diag.cc,
libinterp/octave-value/ov-flt-cx-mat.cc,
libinterp/octave-value/ov-flt-re-diag.cc,
libinterp/octave-value/ov-flt-re-mat.cc, libinterp/octave-value/ov-java.cc,
libinterp/octave-value/ov-range.cc, libinterp/octave-value/ov-re-diag.cc,
libinterp/octave-value/ov-re-mat.cc, libinterp/octave-value/ov-re-sparse.cc,
libinterp/octave-value/ov-scalar.cc, libinterp/octave-value/ov-str-mat.cc,
libinterp/octave-value/ov-usr-fcn.cc, libinterp/parse-tree/pt-cbinop.cc,
libinterp/parse-tree/pt-eval.cc, libinterp/parse-tree/pt-mat.cc:
Follow coding convention of defining and initializing only 1 variable per line
in liboctinterp.
author | Rik <rik@octave.org> |
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date | Thu, 05 Dec 2013 10:50:17 -0800 |
parents | 175b392e91fe |
children | 4197fc428c7d |
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1 /* |
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2 |
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3 Copyright (C) 2008-2013 VZLU Prague a.s., Czech Republic |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by |
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9 the Free Software Foundation; either version 3 of the License, or (at |
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10 your option) any later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but |
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13 WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 General Public License for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, see |
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19 <http://www.gnu.org/licenses/>. |
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20 |
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21 */ |
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22 |
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23 // Author: Jaroslav Hajek <highegg@gmail.com> |
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24 |
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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 #include <cctype> |
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30 #include <functional> |
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31 #include <algorithm> |
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32 |
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33 #include "dNDArray.h" |
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34 #include "CNDArray.h" |
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35 |
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36 #include "Cell.h" |
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37 #include "defun.h" |
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38 #include "error.h" |
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39 #include "gripes.h" |
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40 #include "oct-obj.h" |
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41 #include "ov.h" |
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42 |
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43 static |
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44 bool |
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45 contains_char (const std::string& str, char c) |
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46 { |
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47 return (str.find (c) != std::string::npos |
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48 || str.find (std::toupper (c)) != std::string::npos); |
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49 } |
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50 |
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51 // case-insensitive character comparison functors |
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52 struct icmp_char_lt : public std::binary_function<char, char, bool> |
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53 { |
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54 bool operator () (char x, char y) const |
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55 { return std::toupper (x) < std::toupper (y); } |
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56 }; |
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57 |
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58 struct icmp_char_gt : public std::binary_function<char, char, bool> |
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59 { |
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60 bool operator () (char x, char y) const |
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61 { return std::toupper (x) > std::toupper (y); } |
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62 }; |
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63 |
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64 // FIXME: maybe these should go elsewhere? |
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65 // FIXME: are they even needed now? |
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66 // case-insensitive ascending comparator |
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67 #if 0 |
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68 static bool |
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69 stri_comp_lt (const std::string& a, const std::string& b) |
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70 { |
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71 return std::lexicographical_compare (a.begin (), a.end (), |
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72 b.begin (), b.end (), |
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73 icmp_char_lt ()); |
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74 } |
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75 |
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76 // case-insensitive descending comparator |
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77 static bool |
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78 stri_comp_gt (const std::string& a, const std::string& b) |
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79 { |
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80 return std::lexicographical_compare (a.begin (), a.end (), |
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81 b.begin (), b.end (), |
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82 icmp_char_gt ()); |
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83 } |
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84 #endif |
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85 |
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86 template <class T> |
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87 inline sortmode |
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88 get_sort_mode (const Array<T>& array, |
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89 typename octave_sort<T>::compare_fcn_type desc_comp |
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90 = octave_sort<T>::descending_compare) |
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91 { |
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92 octave_idx_type n = array.numel (); |
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93 if (n > 1 && desc_comp (array (0), array (n-1))) |
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94 return DESCENDING; |
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95 else |
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96 return ASCENDING; |
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97 } |
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98 |
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99 // FIXME: perhaps there should be octave_value::lookup? |
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100 // The question is, how should it behave w.r.t. the second argument's type. |
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101 // We'd need a dispatch on two arguments. Hmmm... |
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102 |
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103 #define INT_ARRAY_LOOKUP(TYPE) \ |
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104 (table.is_ ## TYPE ## _type () && y.is_ ## TYPE ## _type ()) \ |
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105 retval = do_numeric_lookup (table.TYPE ## _array_value (), \ |
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106 y.TYPE ## _array_value (), \ |
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107 left_inf, right_inf, \ |
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108 match_idx, match_bool); |
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109 template <class ArrayT> |
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110 static octave_value |
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111 do_numeric_lookup (const ArrayT& array, const ArrayT& values, |
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112 bool left_inf, bool right_inf, |
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113 bool match_idx, bool match_bool) |
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114 { |
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115 octave_value retval; |
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116 |
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117 Array<octave_idx_type> idx = array.lookup (values); |
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118 octave_idx_type n = array.numel (); |
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119 octave_idx_type nval = values.numel (); |
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120 |
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121 // Post-process. |
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122 if (match_bool) |
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123 { |
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124 boolNDArray match (idx.dims ()); |
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125 for (octave_idx_type i = 0; i < nval; i++) |
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126 { |
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127 octave_idx_type j = idx.xelem (i); |
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128 match.xelem (i) = j != 0 && values(i) == array(j-1); |
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129 } |
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130 |
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131 retval = match; |
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132 } |
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133 else if (match_idx || left_inf || right_inf) |
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134 { |
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135 if (match_idx) |
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136 { |
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137 NDArray ridx (idx.dims ()); |
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138 |
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139 for (octave_idx_type i = 0; i < nval; i++) |
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140 { |
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141 octave_idx_type j = idx.xelem (i); |
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142 ridx.xelem (i) = (j != 0 && values(i) == array(j-1)) ? j : 0; |
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143 } |
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144 |
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145 retval = ridx; |
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146 } |
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147 else if (left_inf && right_inf) |
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148 { |
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149 // Results in valid indices. Optimize using lazy index. |
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150 octave_idx_type zero = 0; |
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151 for (octave_idx_type i = 0; i < nval; i++) |
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152 { |
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153 octave_idx_type j = idx.xelem (i) - 1; |
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154 idx.xelem (i) = std::max (zero, std::min (j, n-2)); |
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155 } |
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156 |
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157 retval = idx_vector (idx); |
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158 } |
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159 else if (left_inf) |
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160 { |
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161 // Results in valid indices. Optimize using lazy index. |
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162 octave_idx_type zero = 0; |
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163 for (octave_idx_type i = 0; i < nval; i++) |
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164 { |
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165 octave_idx_type j = idx.xelem (i) - 1; |
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166 idx.xelem (i) = std::max (zero, j); |
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167 } |
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168 |
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169 retval = idx_vector (idx); |
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170 } |
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171 else if (right_inf) |
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172 { |
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173 NDArray ridx (idx.dims ()); |
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174 |
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175 for (octave_idx_type i = 0; i < nval; i++) |
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176 { |
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177 octave_idx_type j = idx.xelem (i); |
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178 ridx.xelem (i) = std::min (j, n-1); |
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179 } |
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180 |
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181 retval = ridx; |
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182 } |
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183 } |
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184 else |
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185 retval = idx; |
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186 |
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187 return retval; |
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188 } |
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189 |
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190 DEFUN (lookup, args, , |
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191 "-*- texinfo -*-\n\ |
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192 @deftypefn {Built-in Function} {@var{idx} =} lookup (@var{table}, @var{y})\n\ |
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193 @deftypefnx {Built-in Function} {@var{idx} =} lookup (@var{table}, @var{y}, @var{opt})\n\ |
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194 Lookup values in a sorted table. Usually used as a prelude to\n\ |
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195 interpolation.\n\ |
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196 \n\ |
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197 If table is increasing and @code{idx = lookup (table, y)}, then\n\ |
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198 @code{table(idx(i)) <= y(i) < table(idx(i+1))} for all @code{y(i)}\n\ |
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199 within the table. If @code{y(i) < table(1)} then\n\ |
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200 @code{idx(i)} is 0. If @code{y(i) >= table(end)} or @code{isnan (y(i))} then\n\ |
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201 @code{idx(i)} is @code{n}.\n\ |
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202 \n\ |
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203 If the table is decreasing, then the tests are reversed.\n\ |
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204 For non-strictly monotonic tables, empty intervals are always skipped.\n\ |
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205 The result is undefined if @var{table} is not monotonic, or if\n\ |
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206 @var{table} contains a NaN.\n\ |
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207 \n\ |
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208 The complexity of the lookup is O(M*log(N)) where N is the size of\n\ |
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209 @var{table} and M is the size of @var{y}. In the special case when @var{y}\n\ |
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210 is also sorted, the complexity is O(min(M*log(N),M+N)).\n\ |
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212 @var{table} and @var{y} can also be cell arrays of strings\n\ |
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213 (or @var{y} can be a single string). In this case, string lookup\n\ |
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214 is performed using lexicographical comparison.\n\ |
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215 \n\ |
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216 If @var{opts} is specified, it must be a string with letters indicating\n\ |
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217 additional options.\n\ |
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218 \n\ |
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219 @table @code\n\ |
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220 @item m\n\ |
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221 @code{table(idx(i)) == val(i)} if @code{val(i)}\n\ |
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222 occurs in table; otherwise, @code{idx(i)} is zero.\n\ |
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224 @item b\n\ |
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225 @code{idx(i)} is a logical 1 or 0, indicating whether\n\ |
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226 @code{val(i)} is contained in table or not.\n\ |
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227 \n\ |
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228 @item l\n\ |
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229 For numeric lookups\n\ |
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230 the leftmost subinterval shall be extended to infinity (i.e., all indices\n\ |
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231 at least 1)\n\ |
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233 @item r\n\ |
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234 For numeric lookups\n\ |
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235 the rightmost subinterval shall be extended to infinity (i.e., all indices\n\ |
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236 at most n-1).\n\ |
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237 @end table\n\ |
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238 @end deftypefn") |
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239 { |
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240 octave_value retval; |
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241 |
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242 int nargin = args.length (); |
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243 |
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244 if (nargin < 2 || nargin > 3 || (nargin == 3 && ! args(2).is_string ())) |
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245 { |
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246 print_usage (); |
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247 return retval; |
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248 } |
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249 |
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250 octave_value table = args(0); |
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251 octave_value y = args(1); |
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252 if (table.ndims () > 2 || (table.columns () > 1 && table.rows () > 1)) |
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253 warning ("lookup: table is not a vector"); |
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254 |
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255 bool num_case = ((table.is_numeric_type () && y.is_numeric_type ()) |
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256 || (table.is_char_matrix () && y.is_char_matrix ())); |
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257 bool str_case = table.is_cellstr () && (y.is_string () || y.is_cellstr ()); |
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258 bool left_inf = false; |
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259 bool right_inf = false; |
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260 bool match_idx = false; |
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261 bool match_bool = false; |
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262 |
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263 if (nargin == 3) |
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264 { |
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265 std::string opt = args(2).string_value (); |
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266 left_inf = contains_char (opt, 'l'); |
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267 right_inf = contains_char (opt, 'r'); |
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268 match_idx = contains_char (opt, 'm'); |
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269 match_bool = contains_char (opt, 'b'); |
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270 if (opt.find_first_not_of ("lrmb") != std::string::npos) |
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271 { |
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272 error ("lookup: unrecognized option: %c", |
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273 opt[opt.find_first_not_of ("lrmb")]); |
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274 return retval; |
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275 } |
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276 } |
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277 |
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278 if ((match_idx || match_bool) && (left_inf || right_inf)) |
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279 error ("lookup: m, b cannot be specified with l or r"); |
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280 else if (match_idx && match_bool) |
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281 error ("lookup: only one of m or b can be specified"); |
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282 else if (str_case && (left_inf || right_inf)) |
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283 error ("lookup: l, r are not recognized for string lookups"); |
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284 |
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285 if (error_state) |
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286 return retval; |
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287 |
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288 if (num_case) |
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289 { |
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290 |
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291 // In the case of a complex array, absolute values will be used for |
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292 // compatibility (though it's not too meaningful). |
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293 |
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294 if (table.is_complex_type ()) |
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295 table = table.abs (); |
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296 |
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297 if (y.is_complex_type ()) |
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298 y = y.abs (); |
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299 |
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300 Array<octave_idx_type> idx; |
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301 |
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302 // PS: I learned this from data.cc |
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303 if INT_ARRAY_LOOKUP (int8) |
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304 else if INT_ARRAY_LOOKUP (int16) |
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305 else if INT_ARRAY_LOOKUP (int32) |
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306 else if INT_ARRAY_LOOKUP (int64) |
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307 else if INT_ARRAY_LOOKUP (uint8) |
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308 else if INT_ARRAY_LOOKUP (uint16) |
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309 else if INT_ARRAY_LOOKUP (uint32) |
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310 else if INT_ARRAY_LOOKUP (uint64) |
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311 else if (table.is_char_matrix () && y.is_char_matrix ()) |
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312 retval = do_numeric_lookup (table.char_array_value (), |
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313 y.char_array_value (), |
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314 left_inf, right_inf, |
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315 match_idx, match_bool); |
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316 else if (table.is_single_type () || y.is_single_type ()) |
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317 retval = do_numeric_lookup (table.float_array_value (), |
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318 y.float_array_value (), |
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319 left_inf, right_inf, |
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320 match_idx, match_bool); |
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321 else |
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322 retval = do_numeric_lookup (table.array_value (), |
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323 y.array_value (), |
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324 left_inf, right_inf, |
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325 match_idx, match_bool); |
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326 |
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327 } |
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328 else if (str_case) |
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329 { |
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330 Array<std::string> str_table = table.cellstr_value (); |
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331 Array<std::string> str_y (dim_vector (1, 1)); |
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332 |
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333 if (y.is_cellstr ()) |
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334 str_y = y.cellstr_value (); |
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335 else |
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336 str_y(0) = y.string_value (); |
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337 |
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338 Array<octave_idx_type> idx = str_table.lookup (str_y); |
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339 octave_idx_type nval = str_y.numel (); |
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340 |
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341 // Post-process. |
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342 if (match_bool) |
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343 { |
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344 boolNDArray match (idx.dims ()); |
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345 for (octave_idx_type i = 0; i < nval; i++) |
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346 { |
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347 octave_idx_type j = idx.xelem (i); |
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348 match.xelem (i) = j != 0 && str_y(i) == str_table(j-1); |
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349 } |
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350 |
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351 retval = match; |
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352 } |
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353 else if (match_idx) |
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354 { |
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355 NDArray ridx (idx.dims ()); |
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356 if (match_idx) |
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357 { |
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358 for (octave_idx_type i = 0; i < nval; i++) |
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359 { |
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360 octave_idx_type j = idx.xelem (i); |
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361 ridx.xelem (i) = (j != 0 && str_y(i) == str_table(j-1)) ? j |
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362 : 0; |
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363 } |
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364 } |
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365 |
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366 retval = ridx; |
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367 } |
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368 else |
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369 retval = idx; |
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370 } |
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371 else |
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372 print_usage (); |
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373 |
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374 return retval; |
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375 |
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376 } |
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377 |
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378 /* |
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379 %!assert (lookup (1:3, 0.5), 0) # value before table |
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380 %!assert (lookup (1:3, 3.5), 3) # value after table error |
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381 %!assert (lookup (1:3, 1.5), 1) # value within table error |
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382 %!assert (lookup (1:3, [3,2,1]), [3,2,1]) |
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383 %!assert (lookup ([1:4]', [1.2, 3.5]'), [1, 3]') |
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384 %!assert (lookup ([1:4], [1.2, 3.5]'), [1, 3]') |
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385 %!assert (lookup ([1:4]', [1.2, 3.5]), [1, 3]) |
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386 %!assert (lookup ([1:4], [1.2, 3.5]), [1, 3]) |
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387 %!assert (lookup (1:3, [3, 2, 1]), [3, 2, 1]) |
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388 %!assert (lookup ([3:-1:1], [3.5, 3, 1.2, 2.5, 2.5]), [0, 1, 2, 1, 1]) |
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389 %!assert (isempty (lookup ([1:3], []))) |
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390 %!assert (isempty (lookup ([1:3]', []))) |
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391 %!assert (lookup (1:3, [1, 2; 3, 0.5]), [1, 2; 3, 0]) |
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392 %!assert (lookup (1:4, [1, 1.2; 3, 2.5], "m"), [1, 0; 3, 0]) |
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393 %!assert (lookup (4:-1:1, [1, 1.2; 3, 2.5], "m"), [4, 0; 2, 0]) |
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394 %!assert (lookup (1:4, [1, 1.2; 3, 2.5], "b"), logical ([1, 0; 3, 0])) |
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395 %!assert (lookup (4:-1:1, [1, 1.2; 3, 2.5], "b"), logical ([4, 0; 2, 0])) |
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396 %! |
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397 %!assert (lookup ({"apple","lemon","orange"}, {"banana","kiwi"; "ananas","mango"}), [1,1;0,2]) |
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398 %!assert (lookup ({"apple","lemon","orange"}, "potato"), 3) |
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399 %!assert (lookup ({"orange","lemon","apple"}, "potato"), 0) |
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400 */ |