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annotate libinterp/corefcn/lookup.cc @ 23575:e95738a119da

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maint: Deprecate is_cellstr and replace with iscellstr. * ov.h (is_cellstr): Use OCTAVE_DEPRECATED macro for is_cellstr. * ov.h (iscellstr): New function. * Cell.cc, Cell.h, data.cc, graphics.cc, graphics.in.h, lookup.cc, strfns.cc, sysdep.cc, __delaunayn__.cc, __voronoi__.cc, convhulln.cc, ov-base.h, ov-cell.cc, ov-cell.h, ov-java.cc, ov-struct.cc: Replace occurrences of is_cellstr with iscellstr.
author Rik <rik@octave.org>
date Sun, 11 Jun 2017 15:26:14 -0700
parents 855122b993da
children c3075ae020e1
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1 /*
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2
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3 Copyright (C) 2008-2017 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
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10 (at 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
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15 GNU 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 #if defined (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 "errwarn.h"
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40 #include "ovl.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 <typename 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 <typename 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 doc: /* -*- texinfo -*-
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192 @deftypefn {} {@var{idx} =} lookup (@var{table}, @var{y})
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193 @deftypefnx {} {@var{idx} =} lookup (@var{table}, @var{y}, @var{opt})
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194 Lookup values in a sorted table.
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195
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196 This function is usually used as a prelude to interpolation.
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197
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198 If table is increasing and @code{idx = lookup (table, y)}, then
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199 @code{table(idx(i)) <= y(i) < table(idx(i+1))} for all @code{y(i)} within
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200 the table. If @code{y(i) < table(1)} then @code{idx(i)} is 0. If
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201 @code{y(i) >= table(end)} or @code{isnan (y(i))} then @code{idx(i)} is
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202 @code{n}.
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203
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204 If the table is decreasing, then the tests are reversed.
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205 For non-strictly monotonic tables, empty intervals are always skipped.
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206 The result is undefined if @var{table} is not monotonic, or if
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207 @var{table} contains a NaN.
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208
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209 The complexity of the lookup is O(M*log(N)) where N is the size of
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210 @var{table} and M is the size of @var{y}. In the special case when @var{y}
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211 is also sorted, the complexity is O(min(M*log(N),M+N)).
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212
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213 @var{table} and @var{y} can also be cell arrays of strings
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214 (or @var{y} can be a single string). In this case, string lookup
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215 is performed using lexicographical comparison.
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216
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217 If @var{opts} is specified, it must be a string with letters indicating
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218 additional options.
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219
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220 @table @code
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221 @item m
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222 @code{table(idx(i)) == val(i)} if @code{val(i)}
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223 occurs in table; otherwise, @code{idx(i)} is zero.
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224
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225 @item b
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226 @code{idx(i)} is a logical 1 or 0, indicating whether
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227 @code{val(i)} is contained in table or not.
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228
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229 @item l
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230 For numeric lookups
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231 the leftmost subinterval shall be extended to infinity (i.e., all indices
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232 at least 1)
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233
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234 @item r
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235 For numeric lookups
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236 the rightmost subinterval shall be extended to infinity (i.e., all indices
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237 at most n-1).
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238 @end table
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239 @end deftypefn */)
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240 {
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241 int nargin = args.length ();
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242
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243 if (nargin < 2 || nargin > 3)
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244 print_usage ();
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245
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246 octave_value table = args(0);
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247 octave_value y = args(1);
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248 if (table.ndims () > 2 || (table.columns () > 1 && table.rows () > 1))
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249 warning ("lookup: table is not a vector");
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250
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251 octave_value retval;
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252
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253 bool num_case = ((table.is_numeric_type () && y.is_numeric_type ())
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254 || (table.is_char_matrix () && y.is_char_matrix ()));
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255 bool str_case = table.iscellstr () && (y.is_string () || y.iscellstr ());
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256 bool left_inf = false;
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257 bool right_inf = false;
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258 bool match_idx = false;
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259 bool match_bool = false;
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260
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261 if (nargin == 3)
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262 {
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263 std::string opt = args(2).xstring_value ("lookup: OPT must be a string");
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264 left_inf = contains_char (opt, 'l');
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265 right_inf = contains_char (opt, 'r');
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266 match_idx = contains_char (opt, 'm');
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267 match_bool = contains_char (opt, 'b');
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268 if (opt.find_first_not_of ("lrmb") != std::string::npos)
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269 error ("lookup: unrecognized option: %c",
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270 opt[opt.find_first_not_of ("lrmb")]);
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271 }
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272
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273 if ((match_idx || match_bool) && (left_inf || right_inf))
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274 error ("lookup: m, b cannot be specified with l or r");
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275 else if (match_idx && match_bool)
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276 error ("lookup: only one of m or b can be specified");
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277 else if (str_case && (left_inf || right_inf))
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278 error ("lookup: l, r are not recognized for string lookups");
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279
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280 if (num_case)
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281 {
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282 // In the case of a complex array, absolute values will be used for
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283 // compatibility (though it's not too meaningful).
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284 if (table.is_complex_type ())
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285 table = table.abs ();
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286
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287 if (y.is_complex_type ())
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288 y = y.abs ();
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289
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290 Array<octave_idx_type> idx;
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291
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292 // PS: I learned this from data.cc
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293 if INT_ARRAY_LOOKUP (int8)
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294 else if INT_ARRAY_LOOKUP (int16)
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295 else if INT_ARRAY_LOOKUP (int32)
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296 else if INT_ARRAY_LOOKUP (int64)
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297 else if INT_ARRAY_LOOKUP (uint8)
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298 else if INT_ARRAY_LOOKUP (uint16)
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299 else if INT_ARRAY_LOOKUP (uint32)
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300 else if INT_ARRAY_LOOKUP (uint64)
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301 else if (table.is_char_matrix () && y.is_char_matrix ())
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302 retval = do_numeric_lookup (table.char_array_value (),
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303 y.char_array_value (),
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304 left_inf, right_inf,
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305 match_idx, match_bool);
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306 else if (table.is_single_type () || y.is_single_type ())
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307 retval = do_numeric_lookup (table.float_array_value (),
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308 y.float_array_value (),
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309 left_inf, right_inf,
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310 match_idx, match_bool);
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311 else
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312 retval = do_numeric_lookup (table.array_value (),
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313 y.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 }
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317 else if (str_case)
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318 {
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319 Array<std::string> str_table = table.cellstr_value ();
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320 Array<std::string> str_y (dim_vector (1, 1));
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321
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322 if (y.iscellstr ())
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323 str_y = y.cellstr_value ();
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324 else
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325 str_y(0) = y.string_value ();
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326
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327 Array<octave_idx_type> idx = str_table.lookup (str_y);
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328 octave_idx_type nval = str_y.numel ();
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329
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330 // Post-process.
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331 if (match_bool)
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332 {
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333 boolNDArray match (idx.dims ());
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334 for (octave_idx_type i = 0; i < nval; i++)
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335 {
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336 octave_idx_type j = idx.xelem (i);
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337 match.xelem (i) = j != 0 && str_y(i) == str_table(j-1);
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338 }
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339
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340 retval = match;
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341 }
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342 else if (match_idx)
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343 {
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344 NDArray ridx (idx.dims ());
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345 if (match_idx)
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346 {
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347 for (octave_idx_type i = 0; i < nval; i++)
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348 {
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349 octave_idx_type j = idx.xelem (i);
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350 ridx.xelem (i) = (j != 0 && str_y(i) == str_table(j-1) ? j
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351 : 0);
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352 }
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353 }
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354
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355 retval = ridx;
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356 }
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357 else
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358 retval = idx;
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359 }
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360 else
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361 print_usage ();
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362
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363 return retval;
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364 }
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365
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366 /*
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367 %!assert (lookup (1:3, 0.5), 0) # value before table
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368 %!assert (lookup (1:3, 3.5), 3) # value after table error
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369 %!assert (lookup (1:3, 1.5), 1) # value within table error
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370 %!assert (lookup (1:3, [3,2,1]), [3,2,1])
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371 %!assert (lookup ([1:4]', [1.2, 3.5]'), [1, 3]')
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372 %!assert (lookup ([1:4], [1.2, 3.5]'), [1, 3]')
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373 %!assert (lookup ([1:4]', [1.2, 3.5]), [1, 3])
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374 %!assert (lookup ([1:4], [1.2, 3.5]), [1, 3])
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375 %!assert (lookup (1:3, [3, 2, 1]), [3, 2, 1])
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376 %!assert (lookup ([3:-1:1], [3.5, 3, 1.2, 2.5, 2.5]), [0, 1, 2, 1, 1])
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377 %!assert (isempty (lookup ([1:3], [])))
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378 %!assert (isempty (lookup ([1:3]', [])))
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379 %!assert (lookup (1:3, [1, 2; 3, 0.5]), [1, 2; 3, 0])
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380 %!assert (lookup (1:4, [1, 1.2; 3, 2.5], "m"), [1, 0; 3, 0])
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381 %!assert (lookup (4:-1:1, [1, 1.2; 3, 2.5], "m"), [4, 0; 2, 0])
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382 %!assert (lookup (1:4, [1, 1.2; 3, 2.5], "b"), logical ([1, 0; 3, 0]))
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383 %!assert (lookup (4:-1:1, [1, 1.2; 3, 2.5], "b"), logical ([4, 0; 2, 0]))
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384 %!
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385 %!assert (lookup ({"apple","lemon","orange"}, {"banana","kiwi"; "ananas","mango"}), [1,1;0,2])
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386 %!assert (lookup ({"apple","lemon","orange"}, "potato"), 3)
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387 %!assert (lookup ({"orange","lemon","apple"}, "potato"), 0)
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388 */