Mercurial > octave
annotate scripts/general/postpad.m @ 27923:bd51beb6205e
update formatting of copyright notices
* Use <https://octave.org/copyright/> instead of
<https://octave.org/COPYRIGHT.html/>.
* For consistency with other comments in the Octave sources, use
C++-style comments for copyright blocks in C and C++ files.
* Use delimiters above and below copyright blocks that are appropriate
for the language used in the file.
* Eliminate extra spacing inside copyright blocks.
* lex.ll (looks_like_copyright): Also allow newlines and carriage
returns before the word "Copyright".
* scripts/mk-doc.pl (gethelp): Also skip empty comment lines.
* bp-table.cc, type.m: Adjust tests.
author | John W. Eaton <jwe@octave.org> |
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date | Wed, 08 Jan 2020 11:59:41 -0500 |
parents | 1891570abac8 |
children | bdad8ca48700 |
rev | line source |
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1 ######################################################################## |
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2 ## |
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3 ## Copyright (C) 1994-2020 The Octave Project Developers |
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4 ## |
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5 ## See the file COPYRIGHT.md in the top-level directory of this |
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6 ## distribution or <https://octave.org/copyright/>. |
2313 | 7 ## |
8 ## This file is part of Octave. | |
9 ## | |
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10 ## Octave is free software: you can redistribute it and/or modify it |
2313 | 11 ## under the terms of the GNU General Public License as published by |
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12 ## the Free Software Foundation, either version 3 of the License, or |
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13 ## (at your option) any later version. |
2313 | 14 ## |
15 ## Octave is distributed in the hope that it will be useful, but | |
16 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
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17 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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18 ## GNU General Public License for more details. |
2313 | 19 ## |
20 ## You should have received a copy of the GNU General Public License | |
7016 | 21 ## along with Octave; see the file COPYING. If not, see |
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22 ## <https://www.gnu.org/licenses/>. |
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23 ## |
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24 ######################################################################## |
2303 | 25 |
3458 | 26 ## -*- texinfo -*- |
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27 ## @deftypefn {} {} postpad (@var{x}, @var{l}) |
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28 ## @deftypefnx {} {} postpad (@var{x}, @var{l}, @var{c}) |
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29 ## @deftypefnx {} {} postpad (@var{x}, @var{l}, @var{c}, @var{dim}) |
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30 ## Append the scalar value @var{c} to the vector @var{x} until it is of length |
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31 ## @var{l}. If @var{c} is not given, a value of 0 is used. |
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32 ## |
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33 ## If @code{length (@var{x}) > @var{l}}, elements from the end of @var{x} are |
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34 ## removed until a vector of length @var{l} is obtained. |
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35 ## |
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36 ## If @var{x} is a matrix, elements are appended or removed from each row. |
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37 ## |
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38 ## If the optional argument @var{dim} is given, operate along this dimension. |
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39 ## |
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40 ## If @var{dim} is larger than the dimensions of @var{x}, the result will have |
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41 ## @var{dim} dimensions. |
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42 ## @seealso{prepad, cat, resize} |
3458 | 43 ## @end deftypefn |
3428 | 44 |
45 ## Author: Tony Richardson <arichard@stark.cc.oh.us> | |
46 ## Created: June 1994 | |
904 | 47 |
4862 | 48 function y = postpad (x, l, c, dim) |
49 | |
50 if (nargin < 2 || nargin > 4) | |
6046 | 51 print_usage (); |
4862 | 52 endif |
53 | |
54 if (nargin < 3 || isempty (c)) | |
55 c = 0; | |
56 else | |
57 if (! isscalar (c)) | |
58 error ("postpad: third argument must be empty or a scalar"); | |
59 endif | |
60 endif | |
561 | 61 |
4862 | 62 nd = ndims (x); |
63 sz = size (x); | |
64 if (nargin < 4) | |
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65 ## Find the first non-singleton dimension. |
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66 (dim = find (sz > 1, 1)) || (dim = 1); |
4862 | 67 else |
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68 if (!(isscalar (dim) && dim == fix (dim) && dim >= 1)) |
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69 error ("postpad: DIM must be an integer and a valid dimension"); |
4862 | 70 endif |
561 | 71 endif |
72 | |
5459 | 73 if (! isscalar (l) || l < 0) |
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74 error ("postpad: second argument must be a positive scaler"); |
561 | 75 endif |
76 | |
5459 | 77 if (dim > nd) |
78 sz(nd+1:dim) = 1; | |
79 endif | |
80 | |
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81 d = sz(dim); |
5459 | 82 |
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83 if (d == l) |
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84 ## This optimization makes sense because the function is used to match |
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85 ## the length between two vectors not knowing a priori is larger, and |
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86 ## allow for: |
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87 ## ml = max (numel (v1), numel (v2)); |
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88 ## v1 = postpad (v1, ml); |
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89 ## v2 = postpad (v2, ml); |
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90 y = x; |
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91 elseif (d >= l) |
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92 idx = repmat ({':'}, nd, 1); |
7208 | 93 idx{dim} = 1:l; |
94 y = x(idx{:}); | |
561 | 95 else |
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96 sz(dim) = l - d; |
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97 y = cat (dim, x, c(ones (sz))); |
561 | 98 endif |
99 | |
100 endfunction | |
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101 |
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102 |
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103 %!assert (postpad ([1,2], 4), [1,2,0,0]) |
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104 %!assert (postpad ([1;2], 4), [1;2;0;0]) |
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105 %!assert (postpad ([1,2], 4, 2), [1,2,2,2]) |
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106 %!assert (postpad ([1;2], 4, 2), [1;2;2;2]) |
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107 %!assert (postpad ([1,2], 2, 2, 1), [1,2;2,2]) |
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108 %!assert (postpad ([1;2], 2, 2, 3), reshape ([1;2;2;2], 2, 1, 2)) |
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109 %!assert (postpad ([1,2], 2, 2, 3), reshape ([1,2,2,2], 1, 2, 2)) |
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110 |
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111 %!assert (postpad ([1 2], 2), [1 2]) |
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112 %!assert (postpad ([1; 2], 2), [1; 2]) |
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113 %!assert (postpad ([1; 2], 2, 3, 2), [1 3; 2 3]) |
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114 |
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115 %! ## Test with string concatenation |
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116 %!assert <*44162> (postpad ("Octave", 16, "x"), "Octavexxxxxxxxxx") |
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117 %!assert (postpad ("Octave", 4), "Octa") |
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118 |
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119 %!error postpad () |
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120 %!error postpad (1) |
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121 %!error postpad (1,2,3,4,5) |