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scripts/io/strread.m scripts/io/textread.m: new functions
author Soren Hauberg <hauberg@gmail.com>
date Mon, 19 Oct 2009 20:19:40 +0200
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children 09da0bd91412
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9746
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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{}] =} textread (@var{filename})
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19 ## @deftypefnx {Function File} {[@var{a}, @dots{}] =} textread (@var{filename}, @var{format})
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20 ## @deftypefnx {Function File} {[@var{a}, @dots{}] =} textread (@var{filename}, @var{format}, @
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21 ## @var{prop1}, @var{value1}, @dots{})
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22 ## Read data from a text file.
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23 ##
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24 ## The file @var{filename} is read and parsed according to @var{format}. The
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25 ## function behaves like @code{strread} except it works by parsing a file instead
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26 ## of a string. See the documentation of @code{strread} for details.
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27 ## In addition to the options supported by @code{strread}, this function
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28 ## supports one more:
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29 ## @itemize
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30 ## @item "headerlines":
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31 ## @end itemize
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32 ## The first @var{value} number of lines of @var{str} are skipped.
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33 ## @seealso{strread, load, dlmread, fscanf}
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34 ## @end deftypefn
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35
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36 function varargout = textread (filename, formatstr = "%f", varargin)
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37 ## Check input
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38 if (nargin < 1)
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39 print_usage ();
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40 endif
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41
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42 if (!ischar (filename) || !ischar (filename))
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43 error ("textread: first and second input arguments must be strings");
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44 endif
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45
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46 ## Read file
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47 fid = fopen (filename, "r");
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48 if (fid == -1)
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49 error ("textread: could not open '%s' for reading", filename);
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50 endif
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51
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52 ## Maybe skip header lines
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53 headerlines = find (strncmp (varargin, "headerlines"), 1);
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54 if (! isempty (headerlines))
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55 fskipl (fid, headerlines);
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56 varargin(headerlines:headerlines+1) = [];
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57 endif
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58
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59 str = fread (fid, "char=>char").';
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60 fclose (fid);
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61
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62 ## Call strread to make it do the real work
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63 [varargout{1:max (nargout, 1)}] = strread (str, formatstr, varargin {:});
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64 endfunction