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annotate scripts/general/repmat.m @ 20158:7503499a252b stable

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doc: Update docstrings to have one sentence summary as first line. Update scripts in audio, elfun, general, geometry, and image directories. * scripts/audio/@audioplayer/__get_properties__.m, scripts/audio/@audioplayer/audioplayer.m, scripts/audio/@audioplayer/get.m, scripts/audio/@audioplayer/isplaying.m, scripts/audio/@audioplayer/play.m, scripts/audio/@audioplayer/playblocking.m, scripts/audio/@audioplayer/set.m, scripts/audio/@audioplayer/subsasgn.m, scripts/audio/@audioplayer/subsref.m, scripts/audio/@audiorecorder/audiorecorder.m, scripts/audio/@audiorecorder/get.m, scripts/audio/@audiorecorder/getaudiodata.m, scripts/audio/@audiorecorder/getplayer.m, scripts/audio/@audiorecorder/isrecording.m, scripts/audio/@audiorecorder/play.m, scripts/audio/@audiorecorder/record.m, scripts/audio/@audiorecorder/recordblocking.m, scripts/audio/@audiorecorder/set.m, scripts/audio/@audiorecorder/stop.m, scripts/audio/@audiorecorder/subsasgn.m, scripts/audio/@audiorecorder/subsref.m, scripts/audio/lin2mu.m, scripts/audio/mu2lin.m, scripts/audio/record.m, scripts/audio/sound.m, scripts/audio/soundsc.m, scripts/audio/wavread.m, scripts/audio/wavwrite.m, scripts/elfun/cosd.m, scripts/elfun/sind.m, scripts/elfun/tand.m, scripts/general/accumarray.m, scripts/general/accumdim.m, scripts/general/bitcmp.m, scripts/general/bitget.m, scripts/general/bitset.m, scripts/general/blkdiag.m, scripts/general/cart2pol.m, scripts/general/cart2sph.m, scripts/general/cell2mat.m, scripts/general/celldisp.m, scripts/general/chop.m, scripts/general/circshift.m, scripts/general/common_size.m, scripts/general/cplxpair.m, scripts/general/cumtrapz.m, scripts/general/dblquad.m, scripts/general/deal.m, scripts/general/del2.m, scripts/general/display.m, scripts/general/divergence.m, scripts/general/fieldnames.m, scripts/general/flip.m, scripts/general/flipdim.m, scripts/general/fliplr.m, scripts/general/flipud.m, scripts/general/gradient.m, scripts/general/interp3.m, scripts/general/interpft.m, scripts/general/interpn.m, scripts/general/loadobj.m, scripts/general/logspace.m, scripts/general/methods.m, scripts/general/nargchk.m, scripts/general/narginchk.m, scripts/general/nargoutchk.m, scripts/general/nextpow2.m, scripts/general/nthargout.m, scripts/general/num2str.m, scripts/general/pol2cart.m, scripts/general/polyarea.m, scripts/general/postpad.m, scripts/general/prepad.m, scripts/general/profile.m, scripts/general/quadgk.m, scripts/general/quadl.m, scripts/general/quadv.m, scripts/general/randi.m, scripts/general/rat.m, scripts/general/repmat.m, scripts/general/rot90.m, scripts/general/rotdim.m, scripts/general/saveobj.m, scripts/general/shift.m, scripts/general/shiftdim.m, scripts/general/sortrows.m, scripts/general/sph2cart.m, scripts/general/structfun.m, scripts/general/subsindex.m, scripts/general/trapz.m, scripts/general/triplequad.m, scripts/geometry/delaunayn.m, scripts/geometry/dsearch.m, scripts/geometry/dsearchn.m, scripts/geometry/griddata.m, scripts/geometry/griddata3.m, scripts/geometry/griddatan.m, scripts/geometry/inpolygon.m, scripts/geometry/rectint.m, scripts/geometry/tsearchn.m, scripts/geometry/voronoi.m, scripts/geometry/voronoin.m, scripts/help/__unimplemented__.m, scripts/help/doc.m, scripts/help/doc_cache_create.m, scripts/help/get_first_help_sentence.m, scripts/help/help.m, scripts/help/lookfor.m, scripts/help/print_usage.m, scripts/help/type.m, scripts/help/which.m, scripts/image/autumn.m, scripts/image/bone.m, scripts/image/brighten.m, scripts/image/cmpermute.m, scripts/image/colorcube.m, scripts/image/contrast.m, scripts/image/cool.m, scripts/image/copper.m, scripts/image/cubehelix.m, scripts/image/flag.m, scripts/image/gmap40.m, scripts/image/gray.m, scripts/image/gray2ind.m, scripts/image/hot.m, scripts/image/hsv.m, scripts/image/image.m, scripts/image/imagesc.m, scripts/image/imfinfo.m, scripts/image/imformats.m, scripts/image/imread.m, scripts/image/imshow.m, scripts/image/imwrite.m, scripts/image/iscolormap.m, scripts/image/jet.m, scripts/image/lines.m, scripts/image/ntsc2rgb.m, scripts/image/ocean.m, scripts/image/pink.m, scripts/image/prism.m, scripts/image/rainbow.m, scripts/image/rgb2ntsc.m, scripts/image/spinmap.m, scripts/image/spring.m, scripts/image/summer.m, scripts/image/white.m, scripts/image/winter.m: Update docstrings to have one sentence summary as first line. Re-structure to have line lengths <= 80 chars.
author Rik <rik@octave.org>
date Sun, 03 May 2015 09:36:20 -0700
parents 9fc020886ae9
children
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1 ## Copyright (C) 2014-2015 Markus Bergholz
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2 ## Copyright (C) 2000-2015 Paul Kienzle
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3 ## Copyright (C) 2008 Jaroslav Hajek
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4 ##
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5 ## This file is part of Octave.
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6 ##
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7 ## Octave is free software; you can redistribute it and/or modify it
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8 ## under the terms of the GNU General Public License as published by
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9 ## the Free Software Foundation; either version 3 of the License, or (at
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10 ## your option) any later version.
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11 ##
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12 ## Octave is distributed in the hope that it will be useful, but
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13 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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14 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 ## General Public License for more details.
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16 ##
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17 ## You should have received a copy of the GNU General Public License
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18 ## along with Octave; see the file COPYING. If not, see
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19 ## <http://www.gnu.org/licenses/>.
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20
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21 ## -*- texinfo -*-
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22 ## @deftypefn {Function File} {} repmat (@var{A}, @var{m})
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23 ## @deftypefnx {Function File} {} repmat (@var{A}, @var{m}, @var{n})
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24 ## @deftypefnx {Function File} {} repmat (@var{A}, @var{m}, @var{n}, @var{p} @dots{})
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25 ## @deftypefnx {Function File} {} repmat (@var{A}, [@var{m} @var{n}])
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26 ## @deftypefnx {Function File} {} repmat (@var{A}, [@var{m} @var{n} @var{p} @dots{}])
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27 ## Form a block matrix of size @var{m} by @var{n}, with a copy of matrix
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28 ## @var{A} as each element.
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29 ##
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30 ## If @var{n} is not specified, form an @var{m} by @var{m} block matrix. For
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31 ## copying along more than two dimensions, specify the number of times to copy
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32 ## across each dimension @var{m}, @var{n}, @var{p}, @dots{}, in a vector in the
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33 ## second argument.
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34 ## @seealso{repelems}
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35 ## @end deftypefn
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36
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37 ## Author: Paul Kienzle <pkienzle@kienzle.powernet.co.uk>
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38 ## Created: July 2000
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39
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40 function x = repmat (A, m, varargin)
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41
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42 if (nargin < 2)
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43 print_usage ();
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44 endif
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45
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46 if (nargin == 3)
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47 n = varargin{1};
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48 if (! isempty (m) && isempty (n))
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49 m = m(:).';
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50 n = 1;
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51 elseif (isempty (m) && ! isempty (n))
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52 m = n(:).';
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53 n = 1;
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54 elseif (isempty (m) && isempty (n))
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55 m = n = 1;
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56 else
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57 if (all (size (m) > 1))
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58 m = m(:,1);
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59 if (numel (m) < 3)
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60 n = n(end);
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61 else
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62 n = [];
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63 endif
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64 endif
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65 if (all (size (n) > 1))
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66 n = n(:,1);
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67 endif
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68 m = m(:).';
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69 n = n(:).';
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70 endif
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71 else
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72 if (nargin > 3)
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73 ## input check for m and varargin
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74 if (isscalar (m) && all (cellfun ("numel", varargin) == 1))
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75 m = [m varargin{:}];
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76 n = [];
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77 else
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78 error ("repmat: all input arguments must be scalar");
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79 end
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80 elseif (isempty (m))
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81 m = n = 1;
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82 elseif (isscalar (m))
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83 n = m;
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84 elseif (ndims (m) > 2)
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85 error ("repmat: M has more than 2 dimensions");
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86 elseif (all (size (m) > 1))
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87 m = m(:,1).';
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88 n = [];
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89 else
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90 m = m(:).';
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91 n = [];
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92 endif
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93 endif
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94 idx = [m, n];
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95
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96 if (all (idx < 0))
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97 error ("repmat: invalid dimensions");
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98 else
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99 idx = max (idx, 0);
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100 endif
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101
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102 if (numel (A) == 1)
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103 ## optimize the scalar fill case.
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104 if (any (idx == 0))
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105 x = resize (A, idx);
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106 else
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107 x(1:prod (idx)) = A;
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108 x = reshape (x, idx);
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109 endif
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110 elseif (ndims (A) == 2 && length (idx) < 3)
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111 if (issparse (A))
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112 x = kron (ones (idx), A);
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113 else
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114 ## indexing is now faster, so we use it rather than kron.
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115 m = rows (A); n = columns (A);
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116 p = idx(1); q = idx(2);
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117 x = reshape (A, m, 1, n, 1);
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118 x = x(:, ones (1, p), :, ones (1, q));
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119 x = reshape (x, m*p, n*q);
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120 endif
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121 else
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122 aidx = size (A);
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123 ## ensure matching size
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124 idx(end+1:length (aidx)) = 1;
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125 aidx(end+1:length (idx)) = 1;
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126 ## create subscript array
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127 cidx = cell (2, length (aidx));
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128 for i = 1:length (aidx)
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129 cidx{1,i} = ':';
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130 cidx{2,i} = ones (1, idx (i));
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131 endfor
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132 aaidx = aidx;
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133 ## add singleton dims
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134 aaidx(2,:) = 1;
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135 A = reshape (A, aaidx(:));
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136 x = reshape (A (cidx{:}), idx .* aidx);
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137 endif
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138
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139 endfunction
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140
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141
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142 ## Tests for ML compatibility
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143 %!shared x
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144 %! x = [1 2 3];
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145 %!assert (repmat (x, [3, 1]), repmat (x, 3, []))
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146 %!assert (repmat (x, [3, 1]), repmat (x, [], 3))
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147 %!assert (repmat (x, [1, 3]), repmat (x, [], [1, 3]))
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148 %!assert (repmat (x, [1, 3]), repmat (x, [1, 3], []))
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149 %!assert (repmat (x, [1 3]), repmat (x, [1 3; 3 3]))
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150 %!assert (repmat (x, [1 1 2]), repmat (x, [1 1; 1 3; 2 1]))
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151 %!assert (repmat (x, [1 3; 1 3], [1; 3]), repmat (x, [1 1 3]))
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152 %!assert (repmat (x, [1 1], 4), repmat (x, [1 3; 1 3], [1; 4]))
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153 %!assert (repmat (x, [1 1], 4), repmat (x, [1 3; 1 3], [1 2; 3 4]))
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154 %!assert (repmat (x, [1 1], 4), repmat (x, [1 1 4]));
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155 %!assert (repmat (x, [1 1], 4), repmat (x, 1, [1 4]));
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156
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157 ## Test various methods of providing size parameters
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158 %!shared x
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159 %! x = [1 2;3 4];
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160 %!assert (repmat (x, [1 1]), repmat (x, 1))
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161 %!assert (repmat (x, [3 3]), repmat (x, 3))
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162 %!assert (repmat (x, [1 1]), repmat (x, 1, 1))
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163 %!assert (repmat (x, [1 3]), repmat (x, 1, 3))
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164 %!assert (repmat (x, [3 1]), repmat (x, 3, 1))
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165 %!assert (repmat (x, [3 3]), repmat (x, 3, 3))
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166 %!assert (repmat (pi, [1,2,3,4]), repmat (pi, 1,2,3,4))
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167
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168 ## Tests for numel==1 case:
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169 %!shared x, r
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170 %! x = [ 65 ];
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171 %! r = kron (ones (2,2), x);
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172 %!assert (r, repmat (x, [2 2]))
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173 %!assert (char (r), repmat (char (x), [2 2]))
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174 %!assert (int8 (r), repmat (int8 (x), [2 2]))
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175
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176 ## Tests for ndims==2 case:
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177 %!shared x, r
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178 %! x = [ 65 66 67 ];
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179 %! r = kron (ones (2,2), x);
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180 %!assert (r, repmat (x, [2 2]))
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181 %!assert (char (r), repmat (char (x), [2 2]))
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182 %!assert (int8 (r), repmat (int8 (x), [2 2]))
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183
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184 ## Tests for dim>2 case:
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185 %!shared x, r
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186 %! x = [ 65 66 67 ];
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187 %! r = kron (ones (2,2), x);
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188 %! r(:,:,2) = r(:,:,1);
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189 %!assert (r, repmat (x, [2 2 2]))
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190 %!assert (char (r), repmat (char (x), [2 2 2]))
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191 %!assert (int8 (r), repmat (int8 (x), [2 2 2]))
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192
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193 ## Test that sparsity is kept
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194 %!assert (sparse (4,4), repmat (sparse (2,2),[2 2]))
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195
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196 %!assert (size (repmat (".", -1, 1)), [0, 1])
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197 %!assert (size (repmat (".", 1, -1)), [1, 0])
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198
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199 %!assert (size (repmat (1, [1, 0])), [1, 0])
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200 %!assert (size (repmat (1, [5, 0])), [5, 0])
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201 %!assert (size (repmat (1, [0, 1])), [0, 1])
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202 %!assert (size (repmat (1, [0, 5])), [0, 5])
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203
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204 %!shared x
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205 %! x = struct ("a", [], "b", []);
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206 %!assert (size (repmat (x, [1, 0])), [1, 0])
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207 %!assert (size (repmat (x, [5, 0])), [5, 0])
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208 %!assert (size (repmat (x, [0, 1])), [0, 1])
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209 %!assert (size (repmat (x, [0, 5])), [0, 5])
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210
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211 %!assert (size (repmat ({1}, [1, 0])), [1, 0])
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212 %!assert (size (repmat ({1}, [5, 0])), [5, 0])
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213 %!assert (size (repmat ({1}, [0, 1])), [0, 1])
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214 %!assert (size (repmat ({1}, [0, 5])), [0, 5])
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215
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216 %!error (size (repmat (".", -1, -1)))
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217