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annotate src/DLD-FUNCTIONS/lookup.cc @ 8617:4b26e9fbbb37

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fix lookup's docstring
author Jaroslav Hajek <highegg@gmail.com>
date Wed, 28 Jan 2009 13:53:49 +0100
parents 4976f66d469b
children e01c6355304f
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1 /*
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2
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3 Copyright (C) 2008 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 #include <cctype>
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26 #include <functional>
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27 #include <algorithm>
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28
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29 #ifdef HAVE_CONFIG_H
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30 #include <config.h>
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31 #endif
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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 #include "oct-lookup.h"
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36
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37 #include "Cell.h"
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38 #include "defun-dld.h"
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39 #include "error.h"
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40 #include "gripes.h"
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41 #include "oct-obj.h"
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42 #include "ov.h"
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43
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44 static
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45 bool
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46 contains_char (const std::string& str, char c)
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47 {
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48 return (str.find (c) != std::string::npos
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49 || str.find (std::toupper (c)) != std::string::npos);
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50 }
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51
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52 // normal ascending comparator
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53 static bool
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54 ov_str_less (const octave_value& a, const octave_value& b)
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55 {
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56 return a.string_value () < b.string_value ();
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57 }
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58
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59 // normal descending comparator
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60 static bool
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61 ov_str_greater (const octave_value& a, const octave_value& b)
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62 {
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63 return a.string_value () > b.string_value ();
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64 }
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65
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66 // case-insensitive character comparison functors
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67 struct icmp_char_lt : public std::binary_function<char, char, bool>
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68 {
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69 bool operator () (char x, char y) const
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70 { return std::toupper (x) < std::toupper (y); }
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71 };
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72
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73 struct icmp_char_gt : public std::binary_function<char, char, bool>
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74 {
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75 bool operator () (char x, char y) const
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76 { return std::toupper (x) > std::toupper (y); }
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77 };
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78
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79 // case-insensitive ascending comparator
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80 static bool
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81 ov_stri_less (const octave_value& a, const octave_value& b)
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82 {
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83 std::string as = a.string_value ();
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84 std::string bs = b.string_value ();
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85
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86 return std::lexicographical_compare (as.begin (), as.end (),
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87 bs.begin (), bs.end (),
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88 icmp_char_lt());
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89 }
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90
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91 // case-insensitive descending comparator
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92 static bool
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93 ov_stri_greater (const octave_value& a, const octave_value& b)
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94 {
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95 std::string as = a.string_value ();
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96 std::string bs = b.string_value ();
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97
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98 return std::lexicographical_compare (as.begin (), as.end (),
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99 bs.begin (), bs.end (),
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100 icmp_char_gt());
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101 }
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102
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103 DEFUN_DLD (lookup, args, ,
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104 "-*- texinfo -*-\n\
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105 @deftypefn {Loadable Function} {@var{idx} =} lookup (@var{table}, @var{y}, @var{opt})\n\
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106 Lookup values in a sorted table. Usually used as a prelude to\n\
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107 interpolation.\n\
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108 \n\
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109 If table is strictly increasing and @code{idx = lookup (table, y)}, then\n\
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110 @code{table(idx(i)) <= y(i) < table(idx(i+1))} for all @code{y(i)}\n\
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111 within the table. If @code{y(i) < table (1)} then\n\
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112 @code{idx(i)} is 0. If @code{y(i) >= table(end)} then\n\
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113 @code{idx(i)} is @code{table(n)}.\n\
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114 \n\
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115 If the table is strictly decreasing, then the tests are reversed.\n\
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116 There are no guarantees for tables which are non-monotonic or are not\n\
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117 strictly monotonic.\n\
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118 \n\
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119 The algorithm used by lookup is standard binary search, with optimizations\n\
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120 to speed up the case of partially ordered arrays (dense downsampling).\n\
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121 In particular, looking up a single entry is of binary complexity.\n\
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122 \n\
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123 @var{table} and @var{y} can also be a cell array of strings\n\
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124 (or @var{y} can be a single string). In this case, string lookup\n\
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125 is performed using lexicographical comparison.\n\
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126 If @var{opts} is specified, it shall be a string with letters indicating\n\
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127 additional options.\n\
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128 \n\
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129 For numeric lookup, 'l' in @var{opts} indicates that\n\
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130 the leftmost subinterval shall be extended to infinity (i.e. all indices\n\
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131 at least 1), and 'r' indicates that the rightmost subinterval shall be\n\
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132 extended to infinity (i.e. all indices at most n-1).\n\
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133 \n\
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134 For string lookup, 'i' indicates case-insensitive comparison.\n\
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135 @end deftypefn")
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136 {
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137 octave_value_list retval;
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138
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139 int nargin = args.length ();
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140
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141 if (nargin < 2 || nargin > 3 || (nargin == 3 && ! args(2).is_string ()))
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142 {
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143 print_usage ();
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144 return retval;
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145 }
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146
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147 octave_value argtable = args(0), argy = args(1);
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148 if (argtable.ndims () > 2 || (argtable.columns () > 1 && argtable.rows () > 1))
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149 warning ("lookup: table is not a vector");
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150
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151 bool num_case = argtable.is_numeric_type () && argy.is_numeric_type ();
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152 bool str_case = argtable.is_cell () && (argy.is_cell () || argy.is_string ());
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153
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154 if (num_case)
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155 {
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156 bool left_inf = false;
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157 bool right_inf = false;
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158
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159 if (nargin == 3)
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160 {
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161 std::string opt = args(2).string_value ();
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162 left_inf = contains_char (opt, 'l');
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163 right_inf = contains_char (opt, 'r');
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164 }
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165
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166 // in the case of a complex array, absolute values will be used for compatibility
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167 // (though it's not too meaningful).
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168 ArrayN<octave_idx_type> idx;
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169
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170 if (argtable.is_single_type () || argy.is_single_type ())
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171 {
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172 FloatNDArray table = (argtable.is_complex_type ())
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173 ? argtable.float_complex_array_value ().abs ()
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174 : argtable.float_array_value ();
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175
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176 FloatNDArray y = (argy.is_complex_type ())
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177 ? argy.float_complex_array_value ().abs ()
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178 : argy.float_array_value ();
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179
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180 idx = ArrayN<octave_idx_type> (y.dims ());
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181
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182 // determine whether the array is descending.
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183 bool desc = is_descending (table.data (), table.length ());
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184 octave_idx_type offset = left_inf ? 1 : 0;
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185 octave_idx_type size = table.length () - offset - (right_inf ? 1 : 0);
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186 if (size < 0)
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187 size = 0;
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188
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189 if (desc)
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190 seq_lookup (table.data (), offset, size,
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191 y.data (), y.length (), idx.fortran_vec (),
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192 std::greater<float> ());
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193 else
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194 seq_lookup (table.data (), offset, size,
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195 y.data (), y.length (), idx.fortran_vec (),
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196 std::less<float> ());
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197 }
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198 else
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199 {
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200 NDArray table = (argtable.is_complex_type ())
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201 ? argtable.complex_array_value ().abs ()
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202 : argtable.array_value ();
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203
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204 NDArray y = (argy.is_complex_type ())
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205 ? argy.complex_array_value ().abs ()
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206 : argy.array_value ();
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207
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208 idx = ArrayN<octave_idx_type> (y.dims ());
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209
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210 // determine whether the array is descending.
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211 bool desc = is_descending (table.data (), table.length ());
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212 octave_idx_type offset = left_inf ? 1 : 0;
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213 octave_idx_type size = table.length () - offset - (right_inf ? 1 : 0);
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214 if (size < 0)
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215 size = 0;
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216
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217 if (desc)
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218 seq_lookup (table.data (), offset, size,
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219 y.data (), y.length (), idx.fortran_vec (),
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220 std::greater<double> ());
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221 else
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222 seq_lookup (table.data (), offset, size,
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223 y.data (), y.length (), idx.fortran_vec (),
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224 std::less<double> ());
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225 }
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226
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227 retval(0) = NDArray (idx);
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228 }
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229 else if (str_case)
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230 {
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231 Cell table = argtable.cell_value ();
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232
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233 bool (*ov_str_comp) (const octave_value&, const octave_value&);
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234
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235 bool icase = false;
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236
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237 // check for case-insensitive option
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238 if (nargin == 3)
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239 {
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240 std::string opt = args(2).string_value ();
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241 icase = contains_char (opt, 'i');
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242 }
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243
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244 // pick the correct comparator
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245 if (icase)
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246 {
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247 if (is_descending (table.data (), table.length (), ov_stri_less))
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248 ov_str_comp = ov_stri_greater;
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249 else
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250 ov_str_comp = ov_stri_less;
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251 }
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252 else
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253 {
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254 if (is_descending (table.data (), table.length (), ov_str_less))
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255 ov_str_comp = ov_str_greater;
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256 else
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257 ov_str_comp = ov_str_less;
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258 }
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259
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260
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261 // query just the first cell to verify it's a string
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262 if (table(0).is_string ())
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263 {
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264 if (argy.is_cell ())
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265 {
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266 Cell y = argy.cell_value ();
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267 ArrayN<octave_idx_type> idx (y.dims ());
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268
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269
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270
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271 for (int i = 0; i < y.numel (); i++)
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272 idx(i) = bin_lookup (table.data (), table.length (), y(i),
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273 std::ptr_fun (ov_str_comp));
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274
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275 retval(0) = NDArray (idx);
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276 }
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277 else
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278 {
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279 octave_idx_type idx;
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280
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281 idx = bin_lookup (table.data (), table.length (), argy,
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282 std::ptr_fun (ov_str_comp));
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283
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284 retval(0) = static_cast<double> (idx);
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285 }
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286 }
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287 else
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288 error("lookup: table is not a cell array of strings.");
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289 }
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290 else
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291 print_usage ();
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292
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293 return retval;
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294
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295 }
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296
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297 /*
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298 %!assert (real(lookup(1:3, 0.5)), 0) # value before table
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299 %!assert (real(lookup(1:3, 3.5)), 3) # value after table error
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300 %!assert (real(lookup(1:3, 1.5)), 1) # value within table error
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301 %!assert (real(lookup(1:3, [3,2,1])), [3,2,1])
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302 %!assert (real(lookup([1:4]', [1.2, 3.5]')), [1, 3]');
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303 %!assert (real(lookup([1:4], [1.2, 3.5]')), [1, 3]');
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304 %!assert (real(lookup([1:4]', [1.2, 3.5])), [1, 3]);
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305 %!assert (real(lookup([1:4], [1.2, 3.5])), [1, 3]);
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306 %!assert (real(lookup(1:3, [3, 2, 1])), [3, 2, 1]);
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307 %!assert (real(lookup([3:-1:1], [3.5, 3, 1.2, 2.5, 2.5])), [0, 1, 2, 1, 1])
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308 %!assert (isempty(lookup([1:3], [])))
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309 %!assert (isempty(lookup([1:3]', [])))
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310 %!assert (real(lookup(1:3, [1, 2; 3, 0.5])), [1, 2; 3, 0]);
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311 %!
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312 %!assert (real(lookup({"apple","lemon","orange"}, {"banana","kiwi"; "ananas","mango"})), [1,1;0,2])
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313 %!assert (real(lookup({"apple","lemon","orange"}, "potato")), 3)
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314 %!assert (real(lookup({"orange","lemon","apple"}, "potato")), 0)
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Jaroslav Hajek <highegg@gmail.com>
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315 */
4fbaba9abec1 implement compiled binary lookup
Jaroslav Hajek <highegg@gmail.com>
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316
4fbaba9abec1 implement compiled binary lookup
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317 /*
4fbaba9abec1 implement compiled binary lookup
Jaroslav Hajek <highegg@gmail.com>
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318 ;;; Local Variables: ***
4fbaba9abec1 implement compiled binary lookup
Jaroslav Hajek <highegg@gmail.com>
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319 ;;; mode: C++ ***
4fbaba9abec1 implement compiled binary lookup
Jaroslav Hajek <highegg@gmail.com>
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320 ;;; End: ***
4fbaba9abec1 implement compiled binary lookup
Jaroslav Hajek <highegg@gmail.com>
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321 */