/usr/share/octave/packages/interval-2.1.0/@infsup/meshgrid.m is in octave-interval 2.1.0-2.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 | ## Copyright 2015-2016 Oliver Heimlich
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @documentencoding UTF-8
## @deftypemethod {@@infsup} {[@var{XX}, @var{YY}] =} meshgrid (@var{X}, @var{Y})
## @deftypemethodx {@@infsup} {[@var{XX}, @var{YY}, @var{ZZ}] =} meshgrid (@var{X}, @var{Y}, @var{Z})
## @deftypemethodx {@@infsup} {[@var{XX}, @var{YY}] =} meshgrid (@var{X})
## @deftypemethodx {@@infsup} {[@var{XX}, @var{YY}, @var{ZZ}] =} meshgrid (@var{X})
##
## Given vectors of @var{X} and @var{Y} coordinates, return matrices @var{XX}
## and @var{YY} corresponding to a full 2-D grid.
##
## If the optional @var{Z} input is given, or @var{ZZ} is requested, then the
## output will be a full 3-D grid.
##
## Please note that this function does not produce multidimensional arrays in
## the case of 3-D grids like the built-in @code{meshgrid} function. This is
## because interval matrices currently only support two dimensions. The 3-D
## grid is reshaped to fit into two dimensions accordingly.
##
## @end deftypemethod
## Author: Oliver Heimlich
## Keywords: interval
## Created: 2015-07-19
function [xx, yy, zz] = meshgrid (x, y, z)
if (nargin > 3)
print_usage ();
return
endif
if (not (isa (x, "infsup")))
x = infsup (x);
endif
if (nargin >= 2 && not (isa (y, "infsup")))
y = infsup (y);
endif
if (nargin >= 3 && not (isa (z, "infsup")))
z = infsup (z);
endif
switch (nargin)
case 1
if (nargout >= 3)
[lxx, lyy, lzz] = meshgrid (x.inf);
[uxx, uyy, uzz] = meshgrid (x.sup);
else
[lxx, lyy] = meshgrid (x.inf);
[uxx, uyy] = meshgrid (x.sup);
endif
case 2
if (nargout >= 3)
[lxx, lyy, lzz] = meshgrid (x.inf, y.inf);
[uxx, uyy, uzz] = meshgrid (x.sup, y.sup);
else
[lxx, lyy] = meshgrid (x.inf, y.inf);
[uxx, uyy] = meshgrid (x.sup, y.sup);
endif
case 3
[lxx, lyy, lzz] = meshgrid (x.inf, y.inf, z.inf);
[uxx, uyy, uzz] = meshgrid (x.sup, y.sup, z.sup);
endswitch
if (nargout >= 3 || nargin >= 3)
## Reshape 3 dimensions into 2 dimensions
f = @(A) reshape (A, [size(A, 1), prod(size (A)(2 : end))]);
lxx = f (lxx);
uxx = f (uxx);
lyy = f (lyy);
uyy = f (uyy);
lzz = f (lzz);
uzz = f (uzz);
endif
xx = yy = x;
xx.inf = lxx;
xx.sup = uxx;
yy.inf = lyy;
yy.sup = uyy;
if (nargout >= 3)
zz = x;
zz.inf = lzz;
zz.sup = uzz;
endif
endfunction
%!assert (isequal (meshgrid (infsup (0 : 3)), infsup (meshgrid (0 : 3))));
%!demo
%! clf
%! blue = [38 139 210] ./ 255;
%! shade = [238 232 213] ./ 255;
%! [x, y, z] = meshgrid (midrad (1 : 6, 0.125));
%! plot3 (x, y, z, shade, blue)
%! view ([-42.5, 30])
%! box off
%! set (gca, "xgrid", "on", "ygrid", "on", "zgrid", "on")
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