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Fix docstrings, add examples, references and tests to string functions
author Thorsten Meyer <thorsten.meyier@gmx.de>
date Mon, 05 Jan 2009 08:11:03 +0100
parents 3a4694d67dbb
children fd11a08a9b31
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1 ## Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2003,
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2 ## 2005, 2006, 2007 John W. Eaton
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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} {} strcat (@var{s1}, @var{s2}, @dots{})
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22 ## Return a string containing all the arguments concatenated
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23 ## horizontally. If the arguments are cells strings, @code{strcat}
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24 ## returns a cell string with the individual cells concatenated.
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25 ## For numerical input, each element is converted to the
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26 ## corresponding ASCII character. Trailing white space is eliminated.
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27 ## For example,
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28 ##
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29 ## @example
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30 ## @group
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31 ## s = [ "ab"; "cde" ];
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32 ## strcat (s, s, s)
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33 ## @result{} ans =
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34 ## "ab ab ab "
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35 ## "cdecdecde"
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36 ## @end group
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37 ## @end example
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38 ##
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39 ## @example
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40 ## @group
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41 ## s = @{ "ab"; "cde" @};
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42 ## strcat (s, s, s)
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43 ## @result{} ans =
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44 ## @{
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45 ## [1,1] = ababab
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46 ## [2,1] = cdecdecde
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47 ## @}
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48 ## @end group
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49 ## @end example
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50 ##
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51 ## @seealso{cstrcat, char, strvcat}
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52 ## @end deftypefn
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53
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54 ## Author: jwe
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55
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56 function st = strcat (varargin)
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57
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58 if (nargin > 0)
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59 if (nargin == 1)
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60 st = varargin{1};
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61 elseif (nargin > 1)
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62 ## Convert to cells of strings
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63 numstrs(nargin) = 0;
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64 dims{nargin} = [];
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65 allchar = true;
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66 for nv = 1:nargin
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67 if (ischar (varargin{nv}))
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68 varargin{nv} = cellstr (varargin{nv});
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69 elseif (isreal (varargin{nv}))
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70 varargin{nv} = cellstr (char (varargin{nv}));
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71 elseif (isempty (varargin{nv}))
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72 varargin{nv} = cellstr ('');
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73 elseif (iscell (varargin{nv}))
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74 allchar = false;
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75 else
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76 error ("strcat: inputs must be strings or cells of strings.")
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77 endif
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78 dims{nv} = size (varargin{nv});
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79 numstrs(nv) = numel (varargin{nv});
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80 endfor
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81
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82 ## Set all cells to a common size
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83 n = find (numstrs == max (numstrs), 1);
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84 maxstrs = numstrs (n);
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85 dim = dims{n};
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86 for nv = find (numstrs == 1)
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87 str = varargin{nv}{1};
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88 varargin{nv} = cell (dim);
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89 varargin{nv}{:} = str;
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90 endfor
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91
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92 ## Concatenate the strings
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93 st = varargin{1};
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94 for ns = 1:maxstrs
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95 for nv = 2:nargin
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96 if (size_equal (st, varargin{nv}))
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97 st{ns} = [st{ns}, varargin{nv}{ns}];
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98 else
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99 error ("strcat: arguments must be the same size, or be scalars.");
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100 endif
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101 endfor
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102 endfor
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103
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104 if (allchar)
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105 ## If all inputs were strings, return strings.
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106 st = char (st);
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107 endif
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108 endif
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109 else
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110 print_usage ();
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111 endif
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112
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113 endfunction
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114
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115 ## test the dimensionality
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116 ## 1d
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117 %!assert(strcat("ab ", "ab "), "abab")
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118 %!assert(strcat({"ab "}, "ab "), {"ab ab"})
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119 %!assert(strcat("ab ", {"ab "}), {"abab "})
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120 %!assert(strcat({"ab "}, {"ab "}), {"ab ab "})
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121 %!assert(strcat("", "ab"), "ab")
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122 %!assert(strcat("", {"ab"}, {""}), {"ab"})
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123 ## 2d
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124 %!assert(strcat(["ab ";"cde"], ["ab ";"cde"]), ["abab ";"cdecde"])
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125
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126 ## test for deblanking implied trailing spaces of character input
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127 %!assert((strcmp (strcat ("foo", "bar"), "foobar") &&
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128 %! strcmp (strcat (["a"; "bb"], ["foo"; "bar"]), ["afoo "; "bbbar"])));
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129
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130 ## test for mixing character and cell inputs
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131 %!assert(all (strcmp (strcat ("a", {"bc", "de"}, "f"), {"abcf", "adef"})))
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132
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133 ## test for scalar strings with vector strings
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134 %!assert(all (strcmp (strcat (["a"; "b"], "c"), ["ac"; "bc"])))
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136 ## test with cells with strings of differing lengths
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137 %!assert(all (strcmp (strcat ({"a", "bb"}, "ccc"), {"accc", "bbccc"})))
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138 %!assert(all (strcmp (strcat ("a", {"bb", "ccc"}), {"abb", "accc"})))
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139
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140 %!error strcat ();
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141
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142 %!assert (strcat (1, 2), strcat (char(1), char(2)))
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143
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144 %!assert (strcat ('', 2), strcat ([], char(2)))
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145