Mercurial > hg > octave-lyh
annotate scripts/io/strread.m @ 10793:be55736a0783
Grammarcheck the documentation from m-files.
author | Rik <octave@nomad.inbox5.com> |
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date | Sun, 18 Jul 2010 20:35:16 -0700 |
parents | 95c3e38098bf |
children | 693e22af08ae |
rev | line source |
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1 ## Copyright (C) 2009 Eric Chassande-Mottin, CNRS (France) |
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2 ## |
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3 ## This program is free software; you can redistribute it and/or modify |
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4 ## it under the terms of the GNU General Public License as published by |
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5 ## the Free Software Foundation; either version 3 of the License, or |
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6 ## (at your option) any later version. |
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7 ## |
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8 ## This program is distributed in the hope that it will be useful, |
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9 ## but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 ## GNU General Public License for more details. |
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12 ## |
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13 ## You should have received a copy of the GNU General Public License |
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14 ## along with this program; if not, see |
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15 ## <http://www.gnu.org/licenses/>. |
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16 |
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17 ## -*- texinfo -*- |
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18 ## @deftypefn {Function File} {[@var{a}, @dots{}] =} strread (@var{str}) |
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19 ## @deftypefnx {Function File} {[@var{a}, @dots{}] =} strread (@var{str}, @var{format}) |
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20 ## @deftypefnx {Function File} {[@var{a}, @dots{}] =} strread (@var{str}, @var{format}, @ |
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21 ## @var{prop1}, @var{value1}, @dots{}) |
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22 ## Read data from a string. |
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23 ## |
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24 ## The string @var{str} is split into words that are repeatedly matched to the |
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25 ## specifiers in @var{format}. The first word is matched to the first |
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26 ## specifier, |
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27 ## the second to the second specifier and so forth. If there are more words |
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28 ## than |
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29 ## specifiers, the process is repeated until all words have been processed. |
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30 ## |
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31 ## The string @var{format} describes how the words in @var{str} should be |
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32 ## parsed. |
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33 ## It may contain any combination of the following specifiers: |
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34 ## @table @code |
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35 ## @item %s |
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36 ## The word is parsed as a string. |
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37 ## @item %d |
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38 ## @itemx %f |
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39 ## The word is parsed as a number. |
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40 ## @item %* |
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41 ## The word is skipped. |
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42 ## @end table |
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43 ## |
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44 ## Parsed word corresponding to the first specifier are returned in the first |
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45 ## output argument and likewise for the rest of the specifiers. |
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46 ## |
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47 ## By default, @var{format} is @t{"%f"}, meaning that numbers are read from |
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48 ## @var{str}. |
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49 ## |
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50 ## For example, the string |
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51 ## |
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52 ## @example |
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53 ## @group |
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54 ## @var{str} = "\ |
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55 ## Bunny Bugs 5.5\n\ |
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56 ## Duck Daffy -7.5e-5\n\ |
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57 ## Penguin Tux 6" |
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58 ## @end group |
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59 ## @end example |
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60 ## |
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61 ## can be read using |
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62 ## |
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63 ## @example |
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64 ## [@var{a}, @var{b}, @var{c}] = strread (@var{str}, "%s %s %f"); |
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65 ## @end example |
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66 ## |
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67 ## The behaviour of @code{strread} can be changed via properties @var{prop} |
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68 ## @itemize @code |
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69 ## @item "commentstyle": |
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70 ## Parts of @var{str} are considered comments and will be skipped. |
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71 ## @var{value} is the comment style and can be any of the following. |
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72 ## @itemize |
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73 ## @item "shell" |
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74 ## Everything from @code{#} characters to the nearest end-line is skipped. |
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75 ## @item "c" |
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76 ## Everything between @code{/*} and @code{*/} is skipped. |
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77 ## @item "c++" |
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78 ## Everything from @code{//} characters to the nearest end-line is skipped. |
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79 ## @item "matlab" |
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80 ## Everything from @code{%} characters to the nearest end-line is skipped. |
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81 ## @end itemize |
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82 ## @item "delimiter" |
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83 ## Any character in @var{value} will be used to split @var{str} into words. |
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84 ## @item "emptyvalue" |
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85 ## Parts of the output where no word is available is filled with @var{value}. |
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86 ## @end itemize |
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87 ## |
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88 ## @seealso{textread, load, dlmread, fscanf} |
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89 ## @end deftypefn |
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90 |
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91 function varargout = strread (str, formatstr = "%f", varargin) |
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92 ## Check input |
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93 if (nargin < 1) |
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94 print_usage (); |
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95 endif |
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96 |
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97 if (!ischar (str) || !ischar (str)) |
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98 error ("strread: first and second input arguments must be strings"); |
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99 endif |
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100 |
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101 ## Parse options |
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102 comment_flag = false; |
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103 numeric_fill_value = 0; |
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104 white_spaces = " \n\r\t\b"; |
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105 for n = 1:2:length (varargin) |
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106 switch (lower (varargin {n})) |
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107 case "commentstyle" |
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108 comment_flag = true; |
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109 switch (lower (varargin {n+1})) |
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110 case "c" |
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111 comment_specif = {"/*", "*/"}; |
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112 case "c++" |
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113 comment_specif = {"//", "\n"}; |
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114 case "shell" |
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115 comment_specif = {"#", "\n"}; |
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116 case "matlab" |
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117 comment_specif = {"%", "\n"}; |
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118 otherwise |
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119 warning ("strread: unknown comment style '%s'", val); |
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120 endswitch |
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121 case "delimiter" |
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123 case "emptyvalue" |
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125 case "bufsize" |
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126 ## XXX: We could synthesize this, but that just seems weird... |
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128 case "whitespace" |
10549 | 129 white_spaces = varargin {n+1}; |
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130 case "expchars" |
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132 otherwise |
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133 warning ("strread: unknown property \"%s\"", varargin {n}); |
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134 endswitch |
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135 endfor |
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136 |
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137 ## Parse format string |
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138 idx = strfind (formatstr, "%")'; |
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139 specif = formatstr ([idx, idx+1]); |
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140 nspecif = length (idx); |
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141 idx_star = strfind (formatstr, "%*"); |
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142 nfields = length (idx) - length (idx_star); |
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143 |
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144 if (max (nargout, 1) != nfields) |
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145 error ("strread: the number of output variables must match that of format specifiers"); |
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146 endif |
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147 |
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148 ## Remove comments |
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149 if (comment_flag) |
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150 cstart = strfind (str, comment_specif{1}); |
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151 cstop = strfind (str, comment_specif{2}); |
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152 if (length (cstart) > 0) |
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153 ## Ignore nested openers. |
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154 [idx, cidx] = unique (lookup (cstop, cstart), "first"); |
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155 if (idx(end) == length (cstop)) |
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156 cidx(end) = []; # Drop the last one if orphaned. |
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157 endif |
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158 cstart = cstart(cidx); |
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159 endif |
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160 if (length (cstop) > 0) |
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161 ## Ignore nested closers. |
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162 [idx, cidx] = unique (lookup (cstart, cstop), "first"); |
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163 if (idx(1) == 0) |
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164 cidx(1) = []; # Drop the first one if orphaned. |
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165 endif |
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166 cstop = cstop(cidx); |
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167 endif |
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168 len = length (str); |
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169 c2len = length (comment_specif{2}); |
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170 str = cellslices (str, [1, cstop + c2len], [cstart - 1, len]); |
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171 str = [str{:}]; |
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172 endif |
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173 |
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174 ## Split 'str' into words |
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175 words = split_by (str, white_spaces); |
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176 num_words = numel (words); |
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177 num_lines = ceil (num_words / nspecif); |
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178 |
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179 ## For each specifier |
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180 k = 1; |
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181 for m = 1:nspecif |
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182 data = words (m:nspecif:end); |
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183 |
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184 ## Map to format |
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185 switch specif (m, :) |
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186 case "%s" |
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187 data (end+1:num_lines) = {""}; |
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188 varargout {k} = data'; |
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189 k++; |
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190 case {"%d", "%f"} |
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191 data = str2double (data); |
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192 data (end+1:num_lines) = numeric_fill_value; |
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193 varargout {k} = data.'; |
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194 k++; |
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195 case "%*" |
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196 ## do nothing |
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197 endswitch |
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198 endfor |
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199 endfunction |
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200 |
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201 function out = split_by (text, sep) |
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202 out = strtrim (strsplit (text, sep, true)); |
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203 endfunction |
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204 |
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205 %!test |
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206 %! str = "# comment\n# comment\n1 2 3"; |
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207 %! [a, b] = strread (str, '%d %s', 'commentstyle', 'shell'); |
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208 %! assert (a, [1; 3]); |
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209 %! assert (b, {"2"; ""}); |
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210 |
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211 %!test |
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212 %! str = ''; |
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213 %! a = rand (10, 1); |
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214 %! b = char (round (65 + 20 * rand (10, 1))); |
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215 %! for k = 1:10 |
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216 %! str = sprintf ('%s %.6f %s\n', str, a (k), b (k)); |
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217 %! endfor |
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218 %! [aa, bb] = strread (str, '%f %s'); |
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219 %! assert (a, aa, 1e-5); |
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220 %! assert (cellstr (b), bb); |
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221 |
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222 %!test |
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223 %! str = ''; |
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224 %! a = rand (10, 1); |
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225 %! b = char (round (65 + 20 * rand (10, 1))); |
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226 %! for k = 1:10 |
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227 %! str = sprintf ('%s %.6f %s\n', str, a (k), b (k)); |
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228 %! endfor |
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229 %! aa = strread (str, '%f %*s'); |
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230 %! assert (a, aa, 1e-5); |
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231 |
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232 %!test |
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233 %! str = sprintf ('/* this is\nacomment*/ 1 2 3'); |
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234 %! a = strread (str, '%f', 'commentstyle', 'c'); |
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235 %! assert (a, [1; 2; 3]); |
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236 |