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annotate scripts/set/ismember.m @ 20296:23fb65b45d8c

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do not call custom editor at startup and when debugging (bug #44701) * file-editor.cc (call_custom_editor): return with true but without opening a file; (empty_script): do not open an empty script in the cutom editor at startup
author Torsten <ttl@justmail.de>
date Fri, 17 Apr 2015 19:55:24 +0200
parents 4197fc428c7d
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 ## Copyright (C) 2000-2015 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} =} ismember (@var{a}, @var{s}, "rows")
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23 ## @deftypefnx {Function File} {[@var{tf}, @var{s_idx}] =} ismember (@dots{})
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24 ##
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25 ## Return a logical matrix @var{tf} with the same shape as @var{a} which is
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26 ## true (1) if the element in @var{a} is found in @var{s} and false (0) if it
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27 ## is not.
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28 ##
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29 ## If a second output argument is requested then the index into @var{s} of each
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30 ## matching element is also returned.
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31 ##
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32 ## @example
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33 ## @group
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34 ## a = [3, 10, 1];
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35 ## s = [0:9];
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36 ## [tf, s_idx] = ismember (a, s)
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37 ## @result{} tf = [1, 0, 1]
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38 ## @result{} s_idx = [4, 0, 2]
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39 ## @end group
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40 ## @end example
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41 ##
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42 ## The inputs @var{a} and @var{s} may also be cell arrays.
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43 ##
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44 ## @example
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45 ## @group
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46 ## a = @{"abc"@};
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47 ## s = @{"abc", "def"@};
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48 ## [tf, s_idx] = ismember (a, s)
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49 ## @result{} tf = [1, 0]
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50 ## @result{} s_idx = [1, 0]
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51 ## @end group
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52 ## @end example
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53 ##
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54 ## If the optional third argument @qcode{"rows"} is given then compare rows
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55 ## in @var{a} with rows in @var{s}. The inputs must be 2-D matrices with the
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56 ## same number of columns to use this option.
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57 ##
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58 ## @example
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59 ## @group
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60 ## a = [1:3; 5:7; 4:6];
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61 ## s = [0:2; 1:3; 2:4; 3:5; 4:6];
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62 ## [tf, s_idx] = ismember (a, s, "rows")
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63 ## @result{} tf = logical ([1; 0; 1])
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64 ## @result{} s_idx = [2; 0; 5];
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65 ## @end group
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66 ## @end example
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67 ##
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68 ## @seealso{lookup, unique, union, intersect, setdiff, setxor}
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69 ## @end deftypefn
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70
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71 ## Author: Paul Kienzle <pkienzle@users.sf.net>
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72 ## Author: Søren Hauberg <hauberg@gmail.com>
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73 ## Author: Ben Abbott <bpabbott@mac.com>
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74 ## Adapted-by: jwe
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75 ## Reimplemented using lookup & unique: Jaroslav Hajek <highegg@gmail.com>
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76
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77 function [tf, s_idx] = ismember (a, s, varargin)
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78
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79 if (nargin < 2 || nargin > 3)
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80 print_usage ();
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81 endif
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82
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83 ## lookup() does not handle logical values
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84 if (islogical (a))
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85 a = uint8 (a);
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86 endif
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87 if (islogical (s))
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88 s = uint8 (s);
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89 endif
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90
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91 [a, s] = validsetargs ("ismember", a, s, varargin{:});
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92
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93 by_rows = nargin == 3;
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94
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95 if (! by_rows)
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96 s = s(:);
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97 ## Check sort status, because we expect the array will often be sorted.
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98 if (issorted (s))
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99 is = [];
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100 else
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101 [s, is] = sort (s);
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102 endif
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103
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104 ## Remove NaNs from table because lookup can't handle them
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105 if (isreal (s) && ! isempty (s) && isnan (s(end)))
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106 s = s(1:end - sum (isnan (s)));
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107 endif
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108
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109 if (nargout > 1)
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110 s_idx = lookup (s, a, "m");
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111 tf = logical (s_idx);
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112 if (! isempty (is))
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113 s_idx(tf) = is(s_idx(tf));
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114 endif
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115 else
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116 tf = lookup (s, a, "b");
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117 endif
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118
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119 else # "rows" argument
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120 if (isempty (a) || isempty (s))
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121 tf = false (rows (a), 1);
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122 s_idx = zeros (rows (a), 1);
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123 else
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124 if (rows (s) == 1)
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125 tf = all (bsxfun (@eq, a, s), 2);
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126 s_idx = double (tf);
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127 else
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128 ## FIXME: lookup does not support "rows", so we just use unique.
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129 [~, ii, jj] = unique ([a; s], "rows", "last");
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130 na = rows (a);
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131 jj = ii(jj(1:na));
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132 tf = jj > na;
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133
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134 if (nargout > 1)
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135 s_idx = max (0, jj - na);
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136 endif
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137 endif
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138 endif
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139 endif
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140
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141 endfunction
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142
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143
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144 %!assert (ismember ({""}, {"abc", "def"}), false)
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145 %!assert (ismember ("abc", {"abc", "def"}), true)
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146 %!assert (isempty (ismember ([], [1, 2])), true)
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147 %!assert (isempty (ismember ({}, {'a', 'b'})), true)
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148 %!assert (ismember ("", {"abc", "def"}), false)
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149 %!fail ("ismember ([], {1, 2})")
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150 %!fail ("ismember ({[]}, {1, 2})")
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151 %!fail ("ismember ({}, {1, 2})")
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152 %!fail ("ismember ({1}, {'1', '2'})")
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153 %!fail ("ismember (1, 'abc')")
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154 %!fail ("ismember ({'1'}, {'1' '2'},'rows')")
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155 %!fail ("ismember ([1 2 3], [5 4 3 1], 'rows')")
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156 %!assert (ismember ({"foo", "bar"}, {"foobar"}), [false false])
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157 %!assert (ismember ({"foo"}, {"foobar"}), false)
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158 %!assert (ismember ({"bar"}, {"foobar"}), false)
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159 %!assert (ismember ({"bar"}, {"foobar", "bar"}), true)
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160 %!assert (ismember ({"foo", "bar"}, {"foobar", "bar"}), [false true])
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161 %!assert (ismember ({"xfb", "f", "b"}, {"fb", "b"}), [false false true])
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162 %!assert (ismember ("1", "0123456789."), true)
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164 %!test
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165 %! [result, s_idx] = ismember ([1, 2], []);
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166 %! assert (result, [false false])
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167 %! assert (s_idx, [0, 0]);
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168
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169 %!test
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170 %! [result, s_idx] = ismember ([], [1, 2]);
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171 %! assert (result, logical ([]))
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172 %! assert (s_idx, []);
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173
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174 %!test
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175 %! [result, s_idx] = ismember ({"a", "b"}, "");
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176 %! assert (result, [false false])
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177 %! assert (s_idx, [0, 0]);
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178
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179 %!test
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180 %! [result, s_idx] = ismember ({"a", "b"}, {});
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181 %! assert (result, [false false])
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182 %! assert (s_idx, [0, 0]);
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183
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184 %!test
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185 %! [result, s_idx] = ismember ("", {"a", "b"});
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186 %! assert (result, false)
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187 %! assert (s_idx, 0);
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188
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189 %!test
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190 %! [result, s_idx] = ismember ({}, {"a", "b"});
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191 %! assert (result, logical ([]))
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192 %! assert (s_idx, []);
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193
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194 %!test
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195 %! [result, s_idx] = ismember ([1 2 3 4 5], [3]);
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196 %! assert (result, logical ([0 0 1 0 0]))
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197 %! assert (s_idx , [0 0 1 0 0]);
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198
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199 %!test
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200 %! [result, s_idx] = ismember ([1 6], [1 2 3 4 5 1 6 1]);
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201 %! assert (result, [true true]);
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202 %! assert (s_idx(2), 7);
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203
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204 %!test
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205 %! [result, s_idx] = ismember ([3,10,1], [0,1,2,3,4,5,6,7,8,9]);
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206 %! assert (result, [true false true]);
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207 %! assert (s_idx, [4, 0, 2]);
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208
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209 %!test
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210 %! [result, s_idx] = ismember ("1.1", "0123456789.1");
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211 %! assert (result, [true true true]);
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212 %! assert (s_idx, [12, 11, 12]);
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213
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214 %!test
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215 %! [result, s_idx] = ismember ([1:3; 5:7; 4:6], [0:2; 1:3; 2:4; 3:5; 4:6], "rows");
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216 %! assert (result, [true; false; true]);
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217 %! assert (s_idx, [2; 0; 5]);
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218
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219 %!test
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220 %! [result, s_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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221 %! assert (result, [true; false; true]);
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222 %! assert (s_idx, [1; 0; 2]);
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223
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224 %!test
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225 %! [result, s_idx] = ismember ([1:3; 5:7; 4:6; 0:2; 1:3; 2:4], [1:3], "rows");
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226 %! assert (result, logical ([1 0 0 0 1 0]'));
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227 %! assert (s_idx, [1 0 0 0 1 0]');
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228