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annotate scripts/io/textread.m @ 19669:c2031ad6dbe7

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Fix octave header includes in audiodevinfo * audiodevinfo.cc: change includes to use local octave headers
author Vytautas Jančauskas <unaudio@gmail.com>
date Wed, 11 Sep 2013 21:32:14 +0300
parents 1c89599167a6
children 7bbe3658c5ef 446c46af4b42
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 ## Copyright (C) 2009-2013 Eric Chassande-Mottin, CNRS (France)
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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{a}, @dots{}] =} textread (@var{filename})
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21 ## @deftypefnx {Function File} {[@var{a}, @dots{}] =} textread (@var{filename}, @var{format})
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22 ## @deftypefnx {Function File} {[@var{a}, @dots{}] =} textread (@var{filename}, @var{format}, @var{n})
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23 ## @deftypefnx {Function File} {[@var{a}, @dots{}] =} textread (@var{filename}, @var{format}, @var{prop1}, @var{value1}, @dots{})
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24 ## @deftypefnx {Function File} {[@var{a}, @dots{}] =} textread (@var{filename}, @var{format}, @var{n}, @var{prop1}, @var{value1}, @dots{})
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25 ## Read data from a text file.
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26 ##
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27 ## The file @var{filename} is read and parsed according to @var{format}. The
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28 ## function behaves like @code{strread} except it works by parsing a file
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29 ## instead of a string. See the documentation of @code{strread} for details.
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30 ##
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31 ## In addition to the options supported by @code{strread}, this function
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32 ## supports two more:
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33 ##
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34 ## @itemize
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35 ## @item @qcode{"headerlines"}:
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36 ## The first @var{value} number of lines of @var{filename} are skipped.
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37 ##
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38 ## @item @qcode{"endofline"}:
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39 ## Specify a single character or @qcode{"\r\n"}. If no value is given, it
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40 ## will be inferred from the file. If set to "" (empty string) EOLs are
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41 ## ignored as delimiters.
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42 ## @end itemize
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43 ##
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44 ## The optional input @var{n} specifies the number of data lines to read; in
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45 ## this sense it differs slightly from the format repeat count in strread.
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46 ##
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47 ## If the format string is empty (not: omitted) and the file contains only
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48 ## numeric data (excluding headerlines), textread will return a rectangular
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49 ## matrix with the number of columns matching the number of numeric fields on
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50 ## the first data line of the file. Empty fields are returned as zero values.
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51 ##
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52 ## @seealso{strread, load, dlmread, fscanf, textscan}
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53 ## @end deftypefn
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54
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55 function varargout = textread (filename, format = "%f", varargin)
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56
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57 BUFLENGTH = 4096; # Read buffer to speed up processing @var{n}
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58
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59 ## Check input
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60 if (nargin < 1)
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61 print_usage ();
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62 endif
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63
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64 if (! ischar (filename) || ! ischar (format))
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65 error ("textread: FILENAME and FORMAT arguments must be strings");
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66 endif
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67
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68 if (! isempty (varargin) && isnumeric (varargin{1}))
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69 nlines = varargin{1};
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70 else
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71 nlines = Inf;
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72 endif
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73 if (nlines < 1)
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74 printf ("textread: N = 0, no data read\n");
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75 varargout = cell (1, nargout);
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76 return;
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77 endif
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78
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79 ## Read file
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80 fid = fopen (filename, "r");
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81 if (fid == -1)
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82 error ("textread: could not open '%s' for reading", filename);
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83 endif
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84
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85 ## Skip header lines if requested
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86 headerlines = find (strcmpi (varargin, "headerlines"), 1);
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87 if (! isempty (headerlines))
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88 ## Beware of missing or wrong headerline value
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89 if (headerlines == numel (varargin)
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90 || ! isnumeric (varargin{headerlines + 1}))
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91 error ("missing or illegal value for 'headerlines'" );
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92 endif
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93 ## Avoid conveying floats to fskipl
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94 varargin{headerlines + 1} = round (varargin{headerlines + 1});
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95 ## Beware of zero valued headerline, fskipl would skip to EOF
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96 if (varargin{headerlines + 1} > 0)
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97 fskipl (fid, varargin{headerlines + 1});
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98 varargin(headerlines:headerlines+1) = [];
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99 nargin = nargin - 2;
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100 elseif (varargin{headerlines + 1} < 0)
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101 warning ("textread: negative headerline value ignored");
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102 endif
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103 endif
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104 st_pos = ftell (fid);
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105
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106 ## Read a first file chunk. Rest follows after endofline processing
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107 [str, count] = fscanf (fid, "%c", BUFLENGTH);
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108 if (isempty (str) || count < 1)
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109 warning ("textread: empty file");
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110 varargout = cell (1, nargout);
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111 return;
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112 endif
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113
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114 endofline = find (strcmpi (varargin, "endofline"), 1);
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115 if (! isempty (endofline))
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e81ddf9cacd5 maint: untabify and remove trailing whitespace from source files
John W. Eaton <jwe@octave.org>
parents: 12880
diff changeset
116 ## 'endofline' option set by user.
e81ddf9cacd5 maint: untabify and remove trailing whitespace from source files
John W. Eaton <jwe@octave.org>
parents: 12880
diff changeset
117 if (! ischar (varargin{endofline + 1}));
16059
2175c41b12d1 textread.m, textscan.m: catch wrong headerlines values, tests added
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 14868
diff changeset
118 error ("character value required for EndOfLine");
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12866
diff changeset
119 endif
12866
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12860
diff changeset
120 else
14565
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
121 ## Determine EOL from file. Search for EOL candidates in first BUFLENGTH chars
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
122 eol_srch_len = min (length (str), BUFLENGTH);
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12866
diff changeset
123 ## First try DOS (CRLF)
16311
9c4ac8f25a8c textscan.m, textread.m: fix wrong code assessing EOL char(s), remove duplicate code
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16059
diff changeset
124 if (! isempty (strfind (str(1 : eol_srch_len), "\r\n")))
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12866
diff changeset
125 eol_char = "\r\n";
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12866
diff changeset
126 ## Perhaps old Macintosh? (CR)
16311
9c4ac8f25a8c textscan.m, textread.m: fix wrong code assessing EOL char(s), remove duplicate code
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16059
diff changeset
127 elseif (! isempty (strfind (str(1 : eol_srch_len), "\r")))
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12866
diff changeset
128 eol_char = "\r";
16311
9c4ac8f25a8c textscan.m, textread.m: fix wrong code assessing EOL char(s), remove duplicate code
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16059
diff changeset
129 ## Otherwise, use plain *nix (LF)
12866
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12860
diff changeset
130 else
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
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parents: 12866
diff changeset
131 eol_char = "\n";
12866
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12860
diff changeset
132 endif
12877
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parents: 12866
diff changeset
133 ## Set up default endofline param value
14565
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
134 varargin(end+1:end+2) = {"endofline", eol_char};
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12866
diff changeset
135 endif
14565
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
136
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
137 ## Now that we know what EOL looks like, we can process format_repeat_count.
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
138 ## FIXME The below isn't ML-compatible: counts lines, not format string uses
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
139 if (isfinite (nlines) && (nlines > 0))
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
140 l_eol_char = length (eol_char);
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
141 eoi = findstr (str, eol_char);
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
142 n_eoi = length (eoi);
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
143 nblks = 0;
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
144 ## Avoid slow repeated str concatenation, first seek requested end of data
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
145 while (n_eoi < nlines && count == BUFLENGTH)
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
146 [nstr, count] = fscanf (fid, "%c", BUFLENGTH);
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
147 if (count > 0)
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
148 ## Watch out for multichar EOL being missed across buffer boundaries
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
149 if (l_eol_char > 1)
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
150 str = [str(end - length (eol_char) + 2 : end) nstr];
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
151 else
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
152 str = nstr;
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
153 endif
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
154 eoi = findstr (str, eol_char);
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
155 n_eoi += numel (eoi);
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
156 ++nblks;
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
157 endif
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
158 endwhile
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
159 ## Found EOL delimiting last requested line. Compute ptr (incl. EOL)
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
160 if (isempty (eoi))
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
161 printf ("textread: format repeat count specified but no endofline found\n");
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
162 eoi_pos = nblks * BUFLENGTH + count;
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
163 else
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
164 eoi_pos = (nblks * BUFLENGTH) + eoi(end + min (nlines, n_eoi) - n_eoi);
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
165 endif
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
166 fseek (fid, st_pos, "bof");
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
167 str = fscanf (fid, "%c", eoi_pos);
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
168 else
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
169 fseek (fid, st_pos, "bof");
14868
5d3a684236b0 maint: Use Octave coding conventions for cuddling parentheses in scripts directory
Rik <octave@nomad.inbox5.com>
parents: 14621
diff changeset
170 str = fread (fid, "char=>char").';
14565
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
171 endif
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
172 fclose (fid);
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
173
12877
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Rik <octave@nomad.inbox5.com>
parents: 12866
diff changeset
174 ## Set up default whitespace param value if needed
14565
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
175 if (isempty (find (strcmpi ("whitespace", varargin))))
98aaebc56d7c 2012-03-25 Philip Nienhuis <prnienhuis@users.sf.net>
Philip Nienhuis <prnienhuis@@users.sf.net>
parents: 14430
diff changeset
176 varargin(end+1:end+2) = {"whitespace", " \b\t"};
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12866
diff changeset
177 endif
12866
fe6e2afcd9ee Revamp strread, textscan, textread functions for Matlab compatability
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 12860
diff changeset
178
12877
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12866
diff changeset
179 ## Call strread to make it do the real work
ddea3962b024 Various improvements to strread, textread, textscan functions
Rik <octave@nomad.inbox5.com>
parents: 12866
diff changeset
180 [varargout{1:max (nargout, 1)}] = strread (str, format, varargin {:});
11469
c776f063fefe Overhaul m-script files to use common variable name between code and documentation.
Rik <octave@nomad.inbox5.com>
parents: 11104
diff changeset
181
16357
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
182 ## Hack to concatenate/reshape numeric output into 2D array (undocumented ML)
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
183 ## In ML this only works in case of an empty format string
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
184 if (isempty (format))
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
185 ## Get number of fields per line.
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
186 ## 1. Get eol_char position
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
187 iwhsp = find (strcmpi ("whitespace", varargin));
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
188 whsp = varargin{iwhsp + 1};
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
189 idx = regexp (str, eol_char, "once");
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
190 ## 2. Get first data line til EOL. Avoid corner case of just one line
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
191 if (! isempty (idx))
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
192 str = str(1:idx-1);
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
193 endif
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
194 idelimiter = find (strcmpi (varargin, "delimiter"), 1);
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
195 if (isempty (idelimiter))
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
196 ## Assume delimiter = whitespace
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
197 ## 3A. whitespace incl. consecutive whitespace => single space
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
198 str = regexprep (str, sprintf ("[%s]+", whsp), ' ');
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
199 ## 4A. Remove possible leading & trailing spaces
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
200 str = strtrim (str);
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
201 ## 5A. Count spaces, add one to get nr of data fields per line
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
202 ncols = numel (strfind (str, " ")) + 1;
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
203 else
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
204 ## 3B. Just count delimiters. FIXME: delimiters could occur in literals
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
205 delimiter = varargin {idelimiter+1};
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
206 ncols = numel (regexp (str, sprintf ("[%s]", delimiter))) + 1;
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
207 endif
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
208 ## 6. Reshape; watch out, we need a transpose
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
209 nrows = ceil (numel (varargout{1}) / ncols);
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
210 pad = mod (numel (varargout{1}), ncols);
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
211 if (pad > 0)
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
212 pad = ncols - pad;
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
213 varargout{1}(end+1 : end+pad) = NaN;
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
214 endif
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
215 varargout{1} = reshape (varargout{1}, ncols, nrows)';
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
216 ## ML replaces empty values with NaNs
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
217 varargout{1}(find (isnan (varargout{1}))) = 0;
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
218 endif
0cbe330f39a2 textscan.m, textread.m: allow reading multi-column data files with empty format + tests (bug #38317)
Philip Nienhuis <prnienhuis@users.sf.net>
parents: 16311
diff changeset
219
9746
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220 endfunction
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221
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222
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223 %!test
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224 %! f = tmpnam ();
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225 %! d = rand (5, 3);
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226 %! dlmwrite (f, d, "precision", "%5.2f");
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227 %! [a, b, c] = textread (f, "%f %f %f", "delimiter", ",", "headerlines", 3);
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228 %! unlink (f);
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229 %! assert (a, d(4:5, 1), 1e-2);
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230 %! assert (b, d(4:5, 2), 1e-2);
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parents: 12679
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231 %! assert (c, d(4:5, 3), 1e-2);
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232
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233 %!test
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234 %! f = tmpnam ();
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Carlo de Falco <kingcrimson@tiscali.it>
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235 %! d = rand (7, 2);
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236 %! dlmwrite (f, d, "precision", "%5.2f");
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Carlo de Falco <kingcrimson@tiscali.it>
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237 %! [a, b] = textread (f, "%f, %f", "headerlines", 1);
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Carlo de Falco <kingcrimson@tiscali.it>
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238 %! unlink (f);
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Carlo de Falco <kingcrimson@tiscali.it>
parents: 14363
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239 %! assert (a, d(2:7, 1), 1e-2);
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Carlo de Falco <kingcrimson@tiscali.it>
parents: 14363
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240
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241 %% Test reading 2D matrix with empty format
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242 %!test
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243 %! f = tmpnam ();
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244 %! d = rand (5, 2);
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245 %! dlmwrite (f, d, "precision", "%5.2f");
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246 %! A = textread (f, "", "headerlines", 3);
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parents: 16311
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247 %! unlink (f);
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248 %! assert (A, d(4:5, :), 1e-2);
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249
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250 %% Read multiple lines using empty format string
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251 %!test
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252 %! f = tmpnam ();
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253 %! unlink (f);
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254 %! fid = fopen (f, "w");
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255 %! d = rand (1, 4);
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256 %! fprintf (fid, " %f %f %f %f ", d);
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257 %! fclose (fid);
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258 %! A = textread (f, "");
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259 %! unlink (f);
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260 %! assert (A, d, 1e-6);
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261
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262 %% Empty format, corner case = one line w/o EOL
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263 %!test
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264 %! f = tmpnam ();
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265 %! unlink (f);
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266 %! fid = fopen (f, "w");
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267 %! d = rand (1, 4);
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268 %! fprintf (fid, " %f %f %f %f ", d);
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269 %! fclose (fid);
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270 %! A = textread (f, "");
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271 %! unlink (f);
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272 %! assert (A, d, 1e-6);
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273
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274 %% Read multiple lines using empty format string, missing data (should be 0)
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275 %!test
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276 %! f = tmpnam ();
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277 %! unlink (f);
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278 %! fid = fopen (f, "w");
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279 %! d = rand (1, 4);
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280 %! fprintf (fid, "%f, %f, , %f, %f ", d);
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281 %! fclose (fid);
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282 %! A = textread (f, "");
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283 %! unlink (f);
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284 %! assert (A, [ d(1:2) 0 d(3:4)], 1e-6);
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285
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286 %% Test with empty positions - ML returns 0 for empty fields
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287 %!test
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288 %! f = tmpnam ();
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289 %! unlink (f);
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parents: 16311
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290 %! fid = fopen (f, "w");
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parents: 16311
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291 %! d = rand (1, 4);
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292 %! fprintf (fid, ",2,,4\n5,,7,\n");
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parents: 16311
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293 %! fclose (fid);
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parents: 16311
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294 %! A = textread (f, "", "delimiter", ",");
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parents: 16311
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295 %! unlink (f);
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parents: 16311
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296 %! assert (A, [0 2 0 4; 5 0 7 0], 1e-6);
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297
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298 %% Another test with empty format + positions, now with more incomplete lower
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299 %% row (must be appended with zeros to get rectangular matrix)
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300 %!test
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301 %! f = tmpnam ();
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parents: 16311
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302 %! unlink (f);
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parents: 16311
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303 %! fid = fopen (f, "w");
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304 %! d = rand (1, 4);
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parents: 16311
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305 %! fprintf (fid, ",2,,4\n5,\n");
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parents: 16311
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306 %! fclose (fid);
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307 %! A = textread (f, "", "delimiter", ",");
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parents: 16311
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308 %! unlink (f);
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parents: 16311
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309 %! assert (A, [0 2 0 4; 5 0 0 0], 1e-6);
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310
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311 %% Test input validation
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312 %!error textread ()
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parents: 12679
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313 %!error textread (1)
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parents: 14214
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314 %!error <arguments must be strings> textread (1, "%f")
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parents: 12866
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315 %!error <arguments must be strings> textread ("fname", 1)
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parents: 14868
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316 %!error <missing or illegal value for> textread (file_in_loadpath ("textread.m"), "", "headerlines")
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parents: 14868
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317 %!error <missing or illegal value for> textread (file_in_loadpath ("textread.m"), "", "headerlines", 'hh')
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parents: 14868
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318 %!error <character value required for> textread (file_in_loadpath ("textread.m"), "%s", "endofline", true)
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parents: 17312
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319