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maint: update copyright notices for 2012
author John W. Eaton <jwe@octave.org>
date Mon, 02 Jan 2012 14:25:41 -0500
parents e8c52b442a99
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14138
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1 ## Copyright (C) 2000-2012 Paul Kienzle
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2 ## Copyright (C) 2009 Jaroslav Hajek
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {@var{tf} =} ismember (@var{A}, @var{s})
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22 ## @deftypefnx {Function File} {[@var{tf}, @var{S_idx}] =} ismember (@var{A}, @var{s})
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23 ## @deftypefnx {Function File} {[@var{tf}, @var{S_idx}] =} ismember (@var{A}, @var{s}, "rows")
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24 ## Return a logical matrix @var{tf} with the same shape as @var{A} which is
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25 ## true (1) if @code{A(i,j)} is in @var{s} and false (0) if it is not. If a
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26 ## second output argument is requested, the index into @var{s} of each of the
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27 ## matching elements is also returned.
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28 ##
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29 ## @example
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30 ## @group
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31 ## a = [3, 10, 1];
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32 ## s = [0:9];
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33 ## [tf, s_idx] = ismember (a, s);
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34 ## @result{} tf = [1, 0, 1]
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35 ## @result{} s_idx = [4, 0, 2]
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36 ## @end group
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37 ## @end example
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38 ##
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39 ## The inputs, @var{A} and @var{s}, may also be cell arrays.
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40 ##
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41 ## @example
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42 ## @group
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43 ## a = @{'abc'@};
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44 ## s = @{'abc', 'def'@};
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45 ## [tf, s_idx] = ismember (a, s);
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46 ## @result{} tf = [1, 0]
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47 ## @result{} s_idx = [1, 0]
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48 ## @end group
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49 ## @end example
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50 ##
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51 ## With the optional third argument @code{"rows"}, and matrices
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52 ## @var{A} and @var{s} with the same number of columns, compare rows in
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53 ## @var{A} with the rows in @var{s}.
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54 ##
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55 ## @example
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56 ## @group
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57 ## a = [1:3; 5:7; 4:6];
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58 ## s = [0:2; 1:3; 2:4; 3:5; 4:6];
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59 ## [tf, s_idx] = ismember(a, s, 'rows');
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60 ## @result{} tf = logical ([1; 0; 1])
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61 ## @result{} s_idx = [2; 0; 5];
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62 ## @end group
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63 ## @end example
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64 ##
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65 ## @seealso{unique, union, intersect, setxor, setdiff}
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66 ## @end deftypefn
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67
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68 ## Author: Paul Kienzle <pkienzle@users.sf.net>
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69 ## Author: Søren Hauberg <hauberg@gmail.com>
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70 ## Author: Ben Abbott <bpabbott@mac.com>
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71 ## Adapted-by: jwe
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72 ## Reimplemented using lookup & unique: Jaroslav Hajek <highegg@gmail.com>
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73
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74 function [tf, a_idx] = ismember (A, s, varargin)
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75
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76 if (nargin < 2 || nargin > 3)
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77 print_usage ();
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78 endif
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79
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80 ## lookup() does not handle logical values
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81 if (islogical (A))
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82 A = uint8 (A);
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83 endif
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84 if (islogical (s))
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85 s = uint8 (s);
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86 endif
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87
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88 [A, s] = validargs ("ismember", A, s, varargin{:});
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89
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90 if (nargin == 2)
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91 s = s(:);
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92 ## We do it this way, because we expect the array to be often sorted.
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93 if (issorted (s))
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94 is = [];
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95 else
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96 [s, is] = sort (s);
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97 endif
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98
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99 ## sort out NaNs in table
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100 if (isreal (s) && ! isempty (s) && isnan (s(end)))
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101 s = s(1:end - sum (isnan (s)));
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102 endif
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103
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104 if (nargout > 1)
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105 a_idx = lookup (s, A, "m");
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106 tf = logical (a_idx);
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107 if (! isempty (is))
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108 a_idx(tf) = is (a_idx(tf));
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109 endif
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110 else
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111 tf = lookup (s, A, "b");
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112 endif
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113
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114 else
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115
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116 if (isempty (A) || isempty (s))
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117 tf = false (rows (A), 1);
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118 a_idx = zeros (rows (A), 1);
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119 else
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120
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121 ## FIXME: lookup does not support "rows", so we just use unique.
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122 [xx, ii, jj] = unique ([A; s], "rows", "last");
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123 na = rows (A);
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124 jj = ii(jj(1:na));
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125 tf = jj > na;
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126
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127 if (nargout > 1)
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128 a_idx = max (0, jj - na);
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129 endif
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130
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131 endif
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132 endif
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133
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134 endfunction
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135
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136 %!assert (ismember ({''}, {'abc', 'def'}), false);
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137 %!assert (ismember ('abc', {'abc', 'def'}), true);
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138 %!assert (isempty (ismember ([], [1, 2])), true);
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139 %!assert (isempty (ismember ({}, {'a', 'b'})), true);
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140 %!assert (ismember ('', {'abc', 'def'}), false);
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141 %!fail ('ismember ([], {1, 2})');
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142 %!fail ('ismember ({[]}, {1, 2})');
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143 %!fail ('ismember ({}, {1, 2})');
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144 %!fail ('ismember ({1}, {''1'', ''2''})');
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145 %!fail ('ismember (1, ''abc'')');
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146 %!fail ('ismember ({''1''}, {''1'', ''2''},''rows'')');
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147 %!fail ('ismember ([1 2 3], [5 4 3 1], ''rows'')');
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148 %!assert (ismember ({'foo', 'bar'}, {'foobar'}), logical ([0, 0]));
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149 %!assert (ismember ({'foo'}, {'foobar'}), false);
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150 %!assert (ismember ({'bar'}, {'foobar'}), false);
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151 %!assert (ismember ({'bar'}, {'foobar', 'bar'}), true);
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152 %!assert (ismember ({'foo', 'bar'}, {'foobar', 'bar'}), logical ([0, 1]));
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153 %!assert (ismember ({'xfb', 'f', 'b'}, {'fb', 'b'}), logical ([0, 0, 1]));
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154 %!assert (ismember ("1", "0123456789."), true);
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155
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156 %!test
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157 %! [result, a_idx] = ismember ([1, 2], []);
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158 %! assert (result, logical ([0, 0]))
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159 %! assert (a_idx, [0, 0]);
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160
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161 %!test
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162 %! [result, a_idx] = ismember ([], [1, 2]);
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163 %! assert (result, logical ([]))
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164 %! assert (a_idx, []);
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165
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166 %!test
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167 %! [result, a_idx] = ismember ({'a', 'b'}, '');
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168 %! assert (result, logical ([0, 0]))
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169 %! assert (a_idx, [0, 0]);
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170
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171 %!test
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172 %! [result, a_idx] = ismember ({'a', 'b'}, {});
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173 %! assert (result, logical ([0, 0]))
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174 %! assert (a_idx, [0, 0]);
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175
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176 %!test
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177 %! [result, a_idx] = ismember ('', {'a', 'b'});
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178 %! assert (result, false)
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179 %! assert (a_idx, 0);
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180
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181 %!test
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182 %! [result, a_idx] = ismember ({}, {'a', 'b'});
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183 %! assert (result, logical ([]))
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184 %! assert (a_idx, []);
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185
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186 %!test
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187 %! [result, a_idx] = ismember([1 2 3 4 5], [3]);
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188 %! assert (all (result == logical ([0 0 1 0 0])) && all (a_idx == [0 0 1 0 0]));
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189
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190 %!test
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191 %! [result, a_idx] = ismember([1 6], [1 2 3 4 5 1 6 1]);
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192 %! assert (all (result == logical ([1 1])) && a_idx(2) == 7);
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193
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194 %!test
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195 %! [result, a_idx] = ismember ([3,10,1], [0,1,2,3,4,5,6,7,8,9]);
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196 %! assert (all (result == logical ([1, 0, 1])) && all (a_idx == [4, 0, 2]));
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197
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198 %!test
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199 %! [result, a_idx] = ismember ("1.1", "0123456789.1");
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200 %! assert (all (result == logical ([1, 1, 1])) && all (a_idx == [12, 11, 12]));
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201
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202 %!test
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203 %! [result, a_idx] = ismember([1:3; 5:7; 4:6], [0:2; 1:3; 2:4; 3:5; 4:6], 'rows');
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204 %! assert (all (result == logical ([1; 0; 1])) && all (a_idx == [2; 0; 5]));
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205
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206 %!test
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207 %! [result, a_idx] = ismember([1.1,1.2,1.3; 2.1,2.2,2.3; 10,11,12], [1.1,1.2,1.3; 10,11,12; 2.12,2.22,2.32], 'rows');
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208 %! assert (all (result == logical ([1; 0; 1])) && all (a_idx == [1; 0; 2]));
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209