annotate scripts/strings/strjust.m @ 20164:df437a52bcaf stable

doc: Update more docstrings to have one sentence summary as first line. Reviewed miscellaneous, sparse, strings in scripts directory. * scripts/miscellaneous/bzip2.m, scripts/miscellaneous/citation.m, scripts/miscellaneous/compare_versions.m, scripts/miscellaneous/computer.m, scripts/miscellaneous/debug.m, scripts/miscellaneous/dir.m, scripts/miscellaneous/edit.m, scripts/miscellaneous/error_ids.m, scripts/miscellaneous/fileattrib.m, scripts/miscellaneous/fullfile.m, scripts/miscellaneous/genvarname.m, scripts/miscellaneous/gzip.m, scripts/miscellaneous/mkoctfile.m, scripts/miscellaneous/news.m, scripts/miscellaneous/open.m, scripts/miscellaneous/parseparams.m, scripts/miscellaneous/recycle.m, scripts/miscellaneous/run.m, scripts/miscellaneous/swapbytes.m, scripts/miscellaneous/tar.m, scripts/miscellaneous/tmpnam.m, scripts/miscellaneous/unpack.m, scripts/miscellaneous/what.m, scripts/sparse/bicg.m, scripts/sparse/bicgstab.m, scripts/sparse/cgs.m, scripts/sparse/colperm.m, scripts/sparse/eigs.m, scripts/sparse/etreeplot.m, scripts/sparse/gmres.m, scripts/sparse/gplot.m, scripts/sparse/ichol.m, scripts/sparse/ilu.m, scripts/sparse/pcg.m, scripts/sparse/pcr.m, scripts/sparse/qmr.m, scripts/sparse/spaugment.m, scripts/sparse/spconvert.m, scripts/sparse/spdiags.m, scripts/sparse/spfun.m, scripts/sparse/spones.m, scripts/sparse/sprandsym.m, scripts/sparse/spstats.m, scripts/sparse/spy.m, scripts/sparse/svds.m, scripts/sparse/treelayout.m, scripts/sparse/treeplot.m, scripts/strings/base2dec.m, scripts/strings/bin2dec.m, scripts/strings/blanks.m, scripts/strings/cstrcat.m, scripts/strings/deblank.m, scripts/strings/dec2base.m, scripts/strings/dec2bin.m, scripts/strings/dec2hex.m, scripts/strings/findstr.m, scripts/strings/hex2dec.m, scripts/strings/index.m, scripts/strings/isletter.m, scripts/strings/isstrprop.m, scripts/strings/mat2str.m, scripts/strings/ostrsplit.m, scripts/strings/regexptranslate.m, scripts/strings/rindex.m, scripts/strings/str2num.m, scripts/strings/strcat.m, scripts/strings/strchr.m, scripts/strings/strjoin.m, scripts/strings/strjust.m, scripts/strings/strmatch.m, scripts/strings/strsplit.m, scripts/strings/strtok.m, scripts/strings/strtrim.m, scripts/strings/strtrunc.m, scripts/strings/substr.m, scripts/strings/untabify.m, scripts/time/datenum.m: Update more docstrings to have one sentence summary as first line.
author Rik <rik@octave.org>
date Mon, 04 May 2015 14:22:02 -0700
parents 9fc020886ae9
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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4197fc428c7d maint: Update copyright notices for 2015.
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1 ## Copyright (C) 2000-2015 Paul Kienzle
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2 ## Copyright (C) 2009 Jaroslav Hajek
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} strjust (@var{s})
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22 ## @deftypefnx {Function File} {} strjust (@var{s}, @var{pos})
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23 ## Return the text, @var{s}, justified according to @var{pos}, which may
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24 ## be @qcode{"left"}, @qcode{"center"}, or @qcode{"right"}.
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25 ##
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26 ## If @var{pos} is omitted it defaults to @qcode{"right"}.
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27 ##
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28 ## Null characters are replaced by spaces. All other character data are
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29 ## treated as non-white space.
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30 ##
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31 ## Example:
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32 ##
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33 ## @example
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34 ## @group
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35 ## strjust (["a"; "ab"; "abc"; "abcd"])
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36 ## @result{}
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37 ## " a"
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38 ## " ab"
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39 ## " abc"
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40 ## "abcd"
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41 ## @end group
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42 ## @end example
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43 ## @seealso{deblank, strrep, strtrim, untabify}
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44 ## @end deftypefn
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45
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46 function y = strjust (s, pos = "right")
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47
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48 if (nargin < 1 || nargin > 2)
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49 print_usage ();
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50 elseif (! ischar (s) || ndims (s) > 2)
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51 error ("strjust: S must be a string or 2-D character matrix");
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52 endif
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53
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54 if (isempty (s))
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55 y = s;
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56 return;
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57 endif
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58
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59 ## Apparently, Matlab considers nulls to be blanks as well; however, does
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60 ## not preserve the nulls, but rather converts them to blanks. That's a
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61 ## bit unexpected, but it allows simpler processing, because we can move
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62 ## just the nonblank characters. So we'll do the same here.
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63
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64 [nr, nc] = size (s);
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65 ## Find the indices of all nonblanks.
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66 nonbl = s != " " & s != "\0";
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67 [idx, jdx] = find (nonbl);
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68
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69 if (strcmpi (pos, "right"))
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70 ## We wish to find the maximum column index for each row. Because jdx is
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71 ## sorted, we can take advantage of the fact that assignment is processed
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72 ## sequentially and for duplicate indices the last value will remain.
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73 maxs = repmat (nc, [nr, 1]);
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74 maxs(idx) = jdx;
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75 shift = nc - maxs;
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76 elseif (strcmpi (pos, "left"))
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77 ## See above for explanation.
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78 mins = ones (nr, 1);
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79 mins(flipud (idx(:))) = flipud (jdx(:));
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80 shift = 1 - mins;
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81 else
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82 ## Use both of the above to achieve centering.
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83 mins = ones (nr, 1);
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84 mins(flipud (idx(:))) = flipud (jdx(:));
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85 maxs = repmat (nc, [nr, 1]);
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86 maxs(idx) = jdx;
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87 shift = floor ((nc + 1 - maxs - mins) / 2);
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88 endif
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89
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90 ## Adjust the column indices.
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91 jdx += shift (idx);
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92
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93 ## Create a blank matrix and position the nonblank characters.
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94 y = repmat (" ", nr, nc);
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95 y(sub2ind ([nr, nc], idx, jdx)) = s(nonbl);
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96
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97 endfunction
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98
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99
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100 %!assert (strjust (["a"; "ab"; "abc"; "abcd"]),
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101 %! [" a";" ab"; " abc"; "abcd"])
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102 %!assert (strjust ([" a"; " ab"; "abc"; "abcd"], "left"),
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103 %! ["a "; "ab "; "abc "; "abcd"])
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104 %!assert (strjust (["a"; "ab"; "abc"; "abcd"], "CENTER"),
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105 %! [" a "; " ab"; "abc "; "abcd"])
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106 %!assert (strjust (["";""]), "")
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107
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108 ## Test input validation
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109 %!error <Invalid call to strjust> strjust ()
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110 %!error <Invalid call to strjust> strjust (["a";"ab"], "center", 1)
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111 %!error <S must be a string> strjust (ones (3,3))
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112 %!error <S must be a string> strjust (char (ones (3,3,3)))
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113