1######################################################################## 2## 3## Copyright (C) 1993-2021 The Octave Project Developers 4## 5## See the file COPYRIGHT.md in the top-level directory of this 6## distribution or <https://octave.org/copyright/>. 7## 8## This file is part of Octave. 9## 10## Octave is free software: you can redistribute it and/or modify it 11## under the terms of the GNU General Public License as published by 12## the Free Software Foundation, either version 3 of the License, or 13## (at your option) any later version. 14## 15## Octave is distributed in the hope that it will be useful, but 16## WITHOUT ANY WARRANTY; without even the implied warranty of 17## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18## GNU General Public License for more details. 19## 20## You should have received a copy of the GNU General Public License 21## along with Octave; see the file COPYING. If not, see 22## <https://www.gnu.org/licenses/>. 23## 24######################################################################## 25 26## -*- texinfo -*- 27## @deftypefn {} {} flipud (@var{x}) 28## Flip array upside down. 29## 30## Return a copy of @var{x} with the order of the rows reversed. In other 31## words, @var{x} is flipped upside-down about a horizontal axis. For example: 32## 33## @example 34## @group 35## flipud ([1, 2; 3, 4]) 36## @result{} 3 4 37## 1 2 38## @end group 39## @end example 40## 41## @seealso{fliplr, flip, rot90, rotdim} 42## @end deftypefn 43 44function y = flipud (x) 45 46 if (nargin != 1) 47 print_usage (); 48 endif 49 y = flip (x, 1); 50 51endfunction 52 53 54%!assert (flipud ([1, 2; 3, 4]), [3, 4; 1, 2]) 55%!assert (flipud ([1, 2; 3, 4; 5, 6]), [5, 6; 3, 4; 1, 2]) 56%!assert (flipud ([1, 2, 3; 4, 5, 6]), [4, 5, 6; 1, 2, 3]) 57%!assert (flipud ([1 2 3]), [1 2 3]) 58 59## Test NDArrays 60%!test 61%! a(:,:,1) = [ 1 2 3; 4 5 6]; 62%! a(:,:,2) = [ 7 8 9; 10 11 12]; 63%! b(:,:,1) = [ 4 5 6; 1 2 3]; 64%! b(:,:,2) = [10 11 12; 7 8 9]; 65%! assert (flipud (a), b); 66 67## Test NDArray with singleton dimensions 68%!test 69%! a(:,:,:,1) = [ 1 2 3; 4 5 6]; 70%! a(:,:,:,2) = [ 7 8 9; 10 11 12]; 71%! b(:,:,:,1) = [ 4 5 6; 1 2 3]; 72%! b(:,:,:,2) = [10 11 12; 7 8 9]; 73%! assert (flipud (a), b); 74 75## Test for 1 row, i.e., returns the same 76%!test 77%! a(1,:,:,1) = [ 1 2 3 4]; 78%! a(1,:,:,2) = [ 5 6 7 8]; 79%! assert (flipud (a), a); 80 81%!error flipud () 82%!error flipud (1, 2) 83