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annotate scripts/plot/ndgrid.m @ 17182:c3c1ebfaa7dc

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maint: Use common indentation for switch statement. * scripts/general/interp1.m, scripts/geometry/delaunay.m, scripts/help/__unimplemented__.m, scripts/image/cmunique.m, scripts/miscellaneous/edit.m, scripts/optimization/fzero.m, scripts/optimization/sqp.m, scripts/plot/__gnuplot_drawnow__.m, scripts/plot/hidden.m, scripts/plot/legend.m, scripts/plot/print.m, scripts/plot/printd.m, scripts/plot/private/__contour__.m, scripts/plot/private/__fltk_print__.m, scripts/plot/private/__gnuplot_print__.m, scripts/plot/private/__go_draw_axes__.m, scripts/plot/private/__print_parse_opts__.m, scripts/signal/periodogram.m, scripts/sparse/bicg.m, test/slice.tst, test/switch.tst: Use common indentation for switch statement.
author Rik <rik@octave.org>
date Sun, 04 Aug 2013 15:11:34 -0700
parents e205f5ea826a
children db92cd6117a9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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72c96de7a403 maint: update copyright notices for 2012
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1 ## Copyright (C) 2006-2012 Alexander Barth
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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{y1}, @var{y2}, @dots{}, @var{y}n] =} ndgrid (@var{x1}, @var{x2}, @dots{}, @var{x}n)
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21 ## @deftypefnx {Function File} {[@var{y1}, @var{y2}, @dots{}, @var{y}n] =} ndgrid (@var{x})
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22 ## Given n vectors @var{x1}, @dots{} @var{x}n, @code{ndgrid} returns
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23 ## n arrays of dimension n. The elements of the i-th output argument
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24 ## contains the elements of the vector @var{x}i repeated over all
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25 ## dimensions different from the i-th dimension. Calling ndgrid with
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26 ## only one input argument @var{x} is equivalent of calling ndgrid with
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27 ## all n input arguments equal to @var{x}:
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28 ##
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29 ## [@var{y1}, @var{y2}, @dots{}, @var{y}n] = ndgrid (@var{x}, @dots{}, @var{x})
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30 ## @seealso{meshgrid}
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31 ## @end deftypefn
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32
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33 ## Author: Alexander Barth <abarth@marine.usf.edu>
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34
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35 function varargout = ndgrid (varargin)
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36
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37 if (nargin == 0)
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38 print_usage ();
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39 elseif (nargin == 1)
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40 n = max ([nargout, 1]);
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41 ## If only one input argument is given, repeat it n-times
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42 varargin(1:n) = varargin(1);
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43 elseif (nargin >= nargout)
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44 n = max ([nargin, 1]);
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45 else
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46 error ("ndgrid: wrong number of input arguments");
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47 endif
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48
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49 ## Determine the size of the output arguments
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50
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51 shape = zeros (1, n);
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52 for i = 1:n
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53 if (! isvector (varargin{i}) && ! isempty (varargin{i}))
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54 error ("ndgrid: arguments must be vectors");
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55 endif
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56 shape(i) = length (varargin{i});
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57 endfor
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58
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59 for i = 1:n
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60 ## size for reshape
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61 r = ones (1, n);
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62 r(i) = shape(i);
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63
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64 ## size for repmat
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65 s = shape;
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66 s(i) = 1;
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67
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68 varargout{i} = repmat (reshape (varargin{i}, r), s);
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69 endfor
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70
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71 endfunction
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73
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74 %!test
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75 %! x = 1:3;
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76 %! assert (isequal (ndgrid (x), x(:)));
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77
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78 %!test
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79 %! x = 1:3;
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80 %! [XX, YY] = ndgrid (x);
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81 %! assert (size_equal (XX, YY));
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82 %! assert (isequal (XX, repmat(x(:), 1, numel(x))));
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83 %! assert (isequal (YY, repmat(x, numel(x), 1)));
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84
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85 %!test
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86 %! x = 1:2;
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87 %! y = 1:3;
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88 %! z = 1:4;
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89 %! [XX, YY, ZZ] = ndgrid (x, y, z);
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90 %! assert (size_equal (XX, YY, ZZ));
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91 %! assert (ndims (XX), 3);
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92 %! assert (size (XX), [2, 3, 4]);
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93 %! assert (XX(1) * YY(1) * ZZ(1), x(1) * y(1) * z(1));
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94 %! assert (XX(end) * YY(end) * ZZ(end), x(end) * y(end) * z(end));
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95
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96 %!test
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97 %! x = 1:2;
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98 %! y = 1:3;
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99 %! [XX1, YY1] = meshgrid (x, y);
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100 %! [XX2, YY2] = ndgrid (x, y);
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101 %! assert (size_equal (XX1, YY1));
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102 %! assert (size_equal (XX2, YY2));
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103 %! assert (ndims (XX1), 2);
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104 %! assert (size (XX1), [3, 2]);
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105 %! assert (size (XX2), [2, 3]);
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106 %! assert (XX2(1) * YY2(1), x(1) * y(1));
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107 %! assert (XX2(end) * YY2(end), x(end) * y(end));
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108 %! assert (XX1, XX2.');
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109 %! assert (YY1, YY2.');
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110
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111 %!assert (ndgrid ([]), zeros(0,1))
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112 %!assert (ndgrid ([], []), zeros(0,0))
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113
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114 %% Test input validation
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115 %!error ndgrid ()
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116 %!error <wrong number of input arguments> [a,b,c] = ndgrid (1:3,1:3)
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117 %!error <arguments must be vectors> ndgrid (ones (2,2))
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118