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annotate scripts/strings/strjust.m @ 9207:25f50d2d76b3

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improve TR updating strategy for fminunc and fsolve
author Jaroslav Hajek <highegg@gmail.com>
date Sun, 17 May 2009 17:54:51 +0200
parents 58604c45ca74
children fb8834c12035
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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eb63fbe60fab update copyright notices
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 2000, 2001, 2003, 2005, 2006, 2007, 2009 Paul Kienzle
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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} {} strjust (@var{s}, ["left"|"right"|"center"])
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21 ## Shift the non-blank text of @var{s} to the left, right or center of
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22 ## the string. If @var{s} is a string array, justify each string in the
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23 ## array. Null characters are replaced by blanks. If no justification
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24 ## is specified, then all rows are right-justified. For example:
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25 ##
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26 ## @example
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27 ## @group
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28 ## strjust (["a"; "ab"; "abc"; "abcd"])
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29 ## @result{} ans =
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30 ## a
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31 ## ab
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32 ## abc
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33 ## abcd
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34 ## @end group
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35 ## @end example
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36 ## @end deftypefn
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37
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38 function x = strjust (x, just)
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39
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40 if (nargin < 1 || nargin > 2)
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41 print_usage ();
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42 endif
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43
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44 if (nargin == 1)
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45 just = "right";
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46 endif
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47
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48 just = tolower (just);
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49
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50 ## convert nulls to blanks
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51 idx = find (toascii (x) == 0);
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52 if (! isempty (idx))
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53 x(idx) = " ";
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54 endif
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55
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56 ## For all cases, left, right and center, the algorithm is the same.
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57 ## Find the number of blanks at the left/right end to determine the
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58 ## shift, rotate the row index by using mod with that shift, then
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59 ## translate the shifted row index into an array index.
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60 [nr, nc] = size (x);
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61 idx = (x' != " ");
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62 if (strcmp (just, "right"))
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63 [N, hi] = max (cumsum (idx));
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64 shift = hi;
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65 elseif (strcmp (just, "left"))
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66 [N, lo] = max (cumsum (flipud (idx)));
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67 shift = (nc - lo);
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68 else
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69 [N, hi] = max (cumsum (idx));
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70 [N, lo] = max (cumsum (flipud (idx)));
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71 shift = ceil (nc - (lo-hi)/2);
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72 endif
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73 idx = rem (ones(nr,1)*[0:nc-1] + shift'*ones(1,nc), nc);
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74 x = x (idx*nr + [1:nr]'*ones(1,nc));
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75
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76 endfunction
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77
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78 %!error <Invalid call to strjust> strjust();
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79 %!error <Invalid call to strjust> strjust(["a";"ab"], "center", 1);
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80 %!assert (strjust (["a"; "ab"; "abc"; "abcd"]),
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81 %! [" a";" ab"; " abc"; "abcd"]);
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82 %!assert (strjust (["a"; "ab"; "abc"; "abcd"], "center"),
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83 %! [" a "; " ab"; "abc "; "abcd"]);