Mercurial > octave
view scripts/general/flipud.m @ 31248:8b75954a4670
delaunayn: adjust node ordering for positive outward normal vectors (bug #53397)
* delaunayn.m: Check sign of simplex volume, flip node order for negative
volumes to ensure positive (outward-pointing) normal vectors. Add BISTs to
check for positive volumes.
* etc/News.8.md: Append function improvement note to delaunayn change
paragraph under General Improvements.
author | Nicholas R. Jankowski <jankowski.nicholas@gmail.com> |
---|---|
date | Thu, 29 Sep 2022 23:09:05 -0400 |
parents | 5d3faba0342e |
children | 597f3ee61a48 |
line wrap: on
line source
######################################################################## ## ## Copyright (C) 1993-2022 The Octave Project Developers ## ## See the file COPYRIGHT.md in the top-level directory of this ## distribution or <https://octave.org/copyright/>. ## ## This file is part of Octave. ## ## Octave 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. ## ## Octave 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 Octave; see the file COPYING. If not, see ## <https://www.gnu.org/licenses/>. ## ######################################################################## ## -*- texinfo -*- ## @deftypefn {} {@var{B} =} flipud (@var{A}) ## Flip array upside down. ## ## Return a copy of @var{A} with the order of the rows reversed. In other ## words, @var{A} is flipped upside-down about a horizontal axis. For example: ## ## @example ## @group ## flipud ([1, 2; 3, 4]) ## @result{} 3 4 ## 1 2 ## @end group ## @end example ## ## @seealso{fliplr, flip, rot90, rotdim} ## @end deftypefn function B = flipud (A) if (nargin < 1) print_usage (); endif B = flip (A, 1); endfunction %!assert (flipud ([1, 2; 3, 4]), [3, 4; 1, 2]) %!assert (flipud ([1, 2; 3, 4; 5, 6]), [5, 6; 3, 4; 1, 2]) %!assert (flipud ([1, 2, 3; 4, 5, 6]), [4, 5, 6; 1, 2, 3]) %!assert (flipud ([1 2 3]), [1 2 3]) ## Test NDArrays %!test %! a(:,:,1) = [ 1 2 3; 4 5 6]; %! a(:,:,2) = [ 7 8 9; 10 11 12]; %! b(:,:,1) = [ 4 5 6; 1 2 3]; %! b(:,:,2) = [10 11 12; 7 8 9]; %! assert (flipud (a), b); ## Test NDArray with singleton dimensions %!test %! a(:,:,:,1) = [ 1 2 3; 4 5 6]; %! a(:,:,:,2) = [ 7 8 9; 10 11 12]; %! b(:,:,:,1) = [ 4 5 6; 1 2 3]; %! b(:,:,:,2) = [10 11 12; 7 8 9]; %! assert (flipud (a), b); ## Test for 1 row, i.e., returns the same %!test %! a(1,:,:,1) = [ 1 2 3 4]; %! a(1,:,:,2) = [ 5 6 7 8]; %! assert (flipud (a), a); %!error <Invalid call> flipud ()