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annotate scripts/strings/strsplit.m @ 16766:7268845c0a1e

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avoid backquote in error messages, some uses in doc strings * libinterp/corefcn/quadcc.cc, libinterp/interpfcn/file-io.cc, libinterp/octave-value/ov-java.cc, scripts/image/colormap.m, scripts/image/rgbplot.m, scripts/miscellaneous/xor.m, scripts/plot/print.m, scripts/special-matrix/gallery.m, scripts/statistics/base/quantile.m, scripts/strings/strsplit.m: Use ' instead of ` in error messages. Don't use sprintf unnecessarily in error messages. Use @code or @samp instead of `' in doc strings.
author John W. Eaton <jwe@octave.org>
date Tue, 18 Jun 2013 06:39:01 -0400
parents 3ce3579405f8
children 12005245b645
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 ## Copyright (C) 2009-2012 Jaroslav Hajek
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {[@var{cstr}] =} strsplit (@var{s})
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21 ## @deftypefnx {Function File} {[@var{cstr}] =} strsplit (@var{s}, @var{del})
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22 ## @deftypefnx {Function File} {[@var{cstr}] =} strsplit (@dots{}, @var{name}, @var{value})
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23 ## @deftypefnx {Function File} {[@var{cstr}, @var{matches}] =} strsplit (@dots{})
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24 ## Split the string @var{s} using the delimiters specified by @var{del}
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25 ## and return a cell-string array of sub-strings. If a delmiter is not
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26 ## specified the string, @var{s}, is split at whitespace. The delimiter,
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27 ## @var{del} may be a string, a scalar cell-string, or cell-string array.
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28 ## @var{del} must be a cell-string array. By default, consecutive
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29 ## delimiters in the input string, @var{s}, are collapsed into one.
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30 ##
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31 ## The second output, @var{matches}, returns the delmiters which were matched
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32 ## in the original string.
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33 ##
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34 ## Example:
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35 ##
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36 ## @example
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37 ## @group
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38 ## strsplit ("a b c")
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39 ## @result{}
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40 ## @{
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41 ## [1,1] = a
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42 ## [1,2] = b
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43 ## [1,3] = c
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44 ## @}
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45 ##
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46 ## strsplit ("a,b,c", ",")
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47 ## @result{}
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48 ## @{
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49 ## [1,1] = a
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50 ## [1,2] = b
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51 ## [1,3] = c
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52 ## @}
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53 ##
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54 ## strsplit ("a foo b,bar c", @{"\s", "foo", "bar"@})
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55 ## @result{}
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56 ## @{
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57 ## [1,1] = a
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58 ## [1,2] = b
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59 ## [1,3] = c
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60 ## @}
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61 ##
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62 ## strsplit ("a,,b, c", @{",", " "@}, false)
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63 ## @result{}
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64 ## @{
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65 ## [1,1] = a
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66 ## [1,2] =
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67 ## [1,3] = b
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68 ## [1,4] =
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69 ## [1,5] = c
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70 ## @}
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71 ##
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72 ## @end group
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73 ## @end example
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74 ##
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75 ## Supported @var{name}/@var{value} pair arguments are;
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76 ##
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77 ## @itemize
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78 ## @item @var{collapsedelimiters} may take the value of @var{true} or
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79 ## @var{false} with the default being @var{false}.
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80 ## @item @var{delimitertype} may take the value of @code{simple} or
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81 ## @code{regularexpression}. The default is @var{delimitertype} is
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82 ## @code{simple}.
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83 ## @end itemize
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84 ##
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85 ## Example:
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86 ##
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87 ## @example
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88 ## @group
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89 ## strsplit ("a foo b,bar c", ",|\\s|foo|bar", "delimitertype", "regularexpression")
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90 ## @result{}
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91 ## @{
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92 ## [1,1] = a
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93 ## [1,2] = b
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94 ## [1,3] = c
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95 ## @}
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96 ##
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97 ## strsplit ("a,,b, c", "[, ]", false, "delimitertype", "regularexpression")
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98 ## @result{}
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99 ## @{
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100 ## [1,1] = a
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101 ## [1,2] =
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102 ## [1,3] = b
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103 ## [1,4] =
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104 ## [1,5] = c
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105 ## @}
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106 ##
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107 ## strsplit ("a,\t,b, c", @{',', '\s'@}, "delimitertype", "regularexpression")
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108 ## @result{}
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109 ## @{
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110 ## [1,1] = a
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111 ## [1,2] = b
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112 ## [1,3] = c
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113 ## @}
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114 ##
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115 ## strsplit ("a,\t,b, c", @{',', ' ', '\t'@}, "collapsedelimiters", false)
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116 ## @result{}
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117 ## @{
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118 ## [1,1] = a
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119 ## [1,2] =
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120 ## [1,3] =
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121 ## [1,4] = b
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122 ## [1,5] =
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123 ## [1,6] = c
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124 ## @}
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125 ## @end group
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126 ## @end example
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127 ##
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128 ## @seealso{ostrsplit, strjoin, strtok, regexp}
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129 ## @end deftypefn
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130
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131 function [result, matches] = strsplit (str, del, varargin)
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132
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133 args.collapsedelimiters = true;
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134 args.delimitertype = "default";
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135
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136 [reg, params] = parseparams (varargin);
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137
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138 if (nargin < 1)
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139 print_usage ();
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140 elseif (numel (reg) > 1)
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141 print_usage ();
16403
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142 elseif (numel (reg) == 1)
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143 if (islogical (reg{1}) || isnumeric (reg{1}))
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144 args.collapsedelimiters = reg{1};
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145 else
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146 print_usage ();
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147 endif
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diff changeset
148 endif
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
149 fields = fieldnames (args);
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diff changeset
150 for n = 1:2:numel(params)
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diff changeset
151 if (any (strcmpi (params{n}, fields)))
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diff changeset
152 args.(lower(params{n})) = params{n+1};
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153 elseif (ischar (varargin{n}))
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154 error ("strsplit:invalid_parameter_name",
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155 "strsplit: invalid parameter name, '%s'", varargin{n});
16403
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diff changeset
156 else
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157 print_usage ();
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158 endif
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diff changeset
159 endfor
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160
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161 if (strcmpi (args.delimitertype, "default"))
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162 args.delimitertype = "simple";
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163 endif
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164
16403
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165 # Save the length of the "delimitertype" parameter
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166 length_deltype = numel (args.delimitertype);
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167
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diff changeset
168 if (nargin == 1 || (nargin > 1 && (islogical (del) || isnumeric (del))))
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169 if (nargin > 1)
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170 ## Second input is the "collapsedelimiters" parameter
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171 args.collapsedelimiters = del;
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172 endif
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173 ## Set proper default for the delimiter type
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174 if (strncmpi (args.delimitertype, "simple", numel (args.delimitertype)))
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175 del = {" ","\f","\n","\r","\t","\v"};
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176 else
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177 del = "\\s";
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178 endif
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179 endif
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180
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181 if (! ischar (str) || (! ischar (del) && ! iscellstr (del)))
16403
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diff changeset
182 error ("strsplit: S and DEL must be string values");
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183 elseif (! isscalar (args.collapsedelimiters))
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184 error ("strsplit: COLLAPSEDELIMITERS must be a scalar value");
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185 endif
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186
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diff changeset
187 if (strncmpi (args.delimitertype, "simple", length_deltype))
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diff changeset
188 if (iscellstr (del))
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diff changeset
189 del = cellfun (@do_string_escapes, del, "uniformoutput", false);
16403
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diff changeset
190 else
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diff changeset
191 del = do_string_escapes (del);
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diff changeset
192 endif
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193 % This is clumsy, but needed for multi-row strings
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diff changeset
194 del = regexprep (del, '([^\w])', '\\$1');
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195 endif
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196
16403
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diff changeset
197 if (isempty (str))
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diff changeset
198 result = {str};
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diff changeset
199 elseif (strncmpi (args.delimitertype, "regularexpression", length_deltype)
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diff changeset
200 || strncmpi (args.delimitertype, "simple", length_deltype))
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diff changeset
201 if (iscellstr (del))
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diff changeset
202 del = sprintf ('%s|', del{:});
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203 del(end) = [];
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204 endif
16554
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205 if (args.collapsedelimiters)
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206 del = ["(", del, ")+"];
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diff changeset
207 endif
16403
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diff changeset
208 [result, ~, ~, ~, matches] = regexp (str, del, "split");
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209 else
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diff changeset
210 error ("strsplit:invalid_delimitertype",
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diff changeset
211 "strsplit: Invalid DELIMITERTYPE");
16403
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diff changeset
212 endif
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diff changeset
213 endfunction
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214
16403
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215 %!shared str
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216 %! str = "The rain in Spain stays mainly in the plain.";
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217 % Split on all whitespace.
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218 %!assert (strsplit (str), {"The", "rain", "in", "Spain", "stays", ...
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219 %! "mainly", "in", "the", "plain."})
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diff changeset
220 % Split on "ain".
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diff changeset
221 %!assert (strsplit (str, "ain"), {"The r", " in Sp", " stays m", ...
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
222 %! "ly in the pl", "."})
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diff changeset
223 % Split on " " and "ain" (treating multiple delimiters as one).
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diff changeset
224 %!test
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diff changeset
225 %! s = strsplit (str, '\s|ain', true, "delimitertype", "r");
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diff changeset
226 %! assert (s, {"The", "r", "in", "Sp", "stays", "m", "ly", "in", "the", "pl", "."})
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diff changeset
227 %!test
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diff changeset
228 %! s = strsplit (str, "\\s|ain", true, "delimitertype", "r");
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diff changeset
229 %! assert (s, {"The", "r", "in", "Sp", "stays", "m", "ly", "in", "the", "pl", "."})
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diff changeset
230 %!test
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
231 %! [s, m] = strsplit (str, {"\\s", "ain"}, true, "delimitertype", "r");
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
232 %! assert (s, {"The", "r", "in", "Sp", "stays", "m", "ly", "in", "the", "pl", "."})
16554
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diff changeset
233 %! assert (m, {" ", "ain ", " ", "ain ", " ", "ain", " ", " ", " ", "ain"})
16403
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
234 % Split on " " and "ain", and treat multiple delimiters separately.
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
235 %!test
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
236 %! [s, m] = strsplit (str, {" ", "ain"}, "collapsedelimiters", false);
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
237 %! assert (s, {"The", "r", "", "in", "Sp", "", "stays", "m", "ly", "in", "the", "pl", "."})
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
238 %! assert (m, {" ", "ain", " ", " ", "ain", " ", " ", "ain", " ", " ", " ", "ain"})
13701
46e68badedb8 strsplit.m: Expand to accept 2-D character arrays. Improve input validation.
Rik <octave@nomad.inbox5.com>
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diff changeset
239
16403
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
240 %!assert (strsplit ("road to hell"), {"road", "to", "hell"})
13701
46e68badedb8 strsplit.m: Expand to accept 2-D character arrays. Improve input validation.
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diff changeset
241 %!assert (strsplit ("road to hell", " "), {"road", "to", "hell"})
16403
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
242 %!assert (strsplit ("road to^hell", {" ","^"}), {"road", "to", "hell"})
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
243 %!assert (strsplit ("road to--hell", {" ","-"}, true), {"road", "to", "hell"})
16411
5be43435bd5b Improve speed and backward compatibility for strsplit()
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diff changeset
244 %!assert (strsplit (["a,bc,,de"], ",", false, "delimitertype", "s"), {"a", "bc", "", "de"})
16727
3ce3579405f8 Remove the "legacy" delimiter type from strsplit().
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diff changeset
245 %!assert (strsplit (["a,bc,,de"], ",", false), {"a", "bc", "", "de"})
16403
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
246 %!assert (strsplit (["a,bc,de"], ",", true), {"a", "bc", "de"})
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
247 %!assert (strsplit (["a,bc,de"], {","," "}, true), {"a", "bc", "de"})
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
248
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
249 %!assert (strsplit ("road to hell", " ", "delimitertype", "r"), {"road", "to", "hell"})
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
250 %!assert (strsplit ("road to^hell", '\^| ', "delimitertype", "r"), {"road", "to", "hell"})
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
251 %!assert (strsplit ("road to^hell", "[ ^]", "delimitertype", "r"), {"road", "to", "hell"})
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
252 %!assert (strsplit ("road to--hell", "[ -]", false, "delimitertype", "r"), {"road", "", "", "to", "", "hell"})
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
253 %!assert (strsplit (["a,bc,de"], ",", "delimitertype", "r"), {"a", "bc", "de"})
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
254 %!assert (strsplit (["a,bc,,de"], ",", false, "delimitertype", "r"), {"a", "bc", "", "de"})
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
255 %!assert (strsplit (["a,bc,de"], ",", true, "delimitertype", "r"), {"a", "bc", "de"})
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
256 %!assert (strsplit (["a,bc,de"], "[, ]", true, "delimitertype", "r"), {"a", "bc", "de"})
1de4ec2a856d Matlab compatibility for strsplit()
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diff changeset
257 %!assert (strsplit ("hello \t world", 1, "delimitertype", "r"), {"hello", "world"});
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parents:
diff changeset
258
16557
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diff changeset
259 %!assert (strsplit ("foo\tbar", '\t', "delimitertype", "r"), {"foo", "bar"})
d50bca1cdc22 Support escaped characters in sq_strings for strsplit.m.
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diff changeset
260 %!assert (strsplit ("foo\tbar", '\t', "delimitertype", "s"), {"foo", "bar"})
d50bca1cdc22 Support escaped characters in sq_strings for strsplit.m.
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diff changeset
261
16554
03a28487fa9d Collect collapsed delimiters in strsplit().
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diff changeset
262 ## Test "match" for consecutive delmiters
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diff changeset
263 %!test
03a28487fa9d Collect collapsed delimiters in strsplit().
Ben Abbott <bpabbott@mac.com>
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diff changeset
264 %! [a, m] = strsplit ("a\t \nb", '\s', 'delimitertype', 'regularexpression',
03a28487fa9d Collect collapsed delimiters in strsplit().
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diff changeset
265 %! 'collapsedelimiters', false);
03a28487fa9d Collect collapsed delimiters in strsplit().
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diff changeset
266 %! assert (a, {"a", "", "", "b"})
03a28487fa9d Collect collapsed delimiters in strsplit().
Ben Abbott <bpabbott@mac.com>
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diff changeset
267 %! assert (m, {"\t", " ", "\n"})
03a28487fa9d Collect collapsed delimiters in strsplit().
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diff changeset
268 %!test
03a28487fa9d Collect collapsed delimiters in strsplit().
Ben Abbott <bpabbott@mac.com>
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diff changeset
269 %! [a, m] = strsplit ("a\t \nb", '\s', false, 'delimitertype', 'regularexpression');
03a28487fa9d Collect collapsed delimiters in strsplit().
Ben Abbott <bpabbott@mac.com>
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diff changeset
270 %! assert (a, {"a", "", "", "b"})
03a28487fa9d Collect collapsed delimiters in strsplit().
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diff changeset
271 %! assert (m, {"\t", " ", "\n"})
03a28487fa9d Collect collapsed delimiters in strsplit().
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diff changeset
272 %!test
03a28487fa9d Collect collapsed delimiters in strsplit().
Ben Abbott <bpabbott@mac.com>
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diff changeset
273 %! [a, m] = strsplit ("a\t \nb", '\s', "delimitertype", "regularexpression");
03a28487fa9d Collect collapsed delimiters in strsplit().
Ben Abbott <bpabbott@mac.com>
parents: 16411
diff changeset
274 %! assert (a, {"a", "b"})
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Ben Abbott <bpabbott@mac.com>
parents: 16411
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275 %! assert (m, {"\t \n"})
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Ben Abbott <bpabbott@mac.com>
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276 %!test
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Ben Abbott <bpabbott@mac.com>
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277 %! [a, m] = strsplit ("a\t \nb", {"\t", " ", "\n"}, "delimitertype", "simple");
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Ben Abbott <bpabbott@mac.com>
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278 %! assert (a, {"a", "b"})
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Ben Abbott <bpabbott@mac.com>
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279 %! assert (m, {"\t \n"})
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Ben Abbott <bpabbott@mac.com>
parents: 16411
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280 %!test
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Ben Abbott <bpabbott@mac.com>
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281 %! [s, m] = strsplit ("hello \t world", 1);
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Ben Abbott <bpabbott@mac.com>
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282 %! assert (s, {"hello", "world"});
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Ben Abbott <bpabbott@mac.com>
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283 %! assert (m, {" \t "});
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Ben Abbott <bpabbott@mac.com>
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284
16727
3ce3579405f8 Remove the "legacy" delimiter type from strsplit().
Ben Abbott <bpabbott@mac.com>
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285 %% Compatibility
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Ben Abbott <bpabbott@mac.com>
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286 %! assert (strsplit ("", "a"), {""})
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Ben Abbott <bpabbott@mac.com>
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287 %! assert (strsplit ("a", "a"), {"", ""})
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Ben Abbott <bpabbott@mac.com>
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288 %! assert (strsplit ("aa", "a"), {"", ""})
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Ben Abbott <bpabbott@mac.com>
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289 %! assert (strsplit ("aaa", "a"), {"", ""})
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Ben Abbott <bpabbott@mac.com>
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290
13701
46e68badedb8 strsplit.m: Expand to accept 2-D character arrays. Improve input validation.
Rik <octave@nomad.inbox5.com>
parents: 12915
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291 %% Test input validation
46e68badedb8 strsplit.m: Expand to accept 2-D character arrays. Improve input validation.
Rik <octave@nomad.inbox5.com>
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292 %!error strsplit ()
46e68badedb8 strsplit.m: Expand to accept 2-D character arrays. Improve input validation.
Rik <octave@nomad.inbox5.com>
parents: 12915
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293 %!error strsplit ("abc", "b", true, 4)
16403
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
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294 %!error <S and DEL must be string values> strsplit (123, "b")
1de4ec2a856d Matlab compatibility for strsplit()
Ben Abbott <bpabbott@mac.com>
parents: 15521
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295 %!error <COLLAPSEDELIMITERS must be a scalar value> strsplit ("abc", "def", ones (3,3))
8877
2c8b2399247b implement strsplit; deprecate split
Jaroslav Hajek <highegg@gmail.com>
parents:
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296