Mercurial > octave-nkf
comparison scripts/general/flipdim.m @ 5012:ed25bed43409
[project @ 2004-09-21 15:45:48 by jwe]
| author | jwe |
|---|---|
| date | Tue, 21 Sep 2004 15:45:48 +0000 |
| parents | |
| children | 1c65a8e44ef9 |
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| 5011:1743bf921773 | 5012:ed25bed43409 |
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| 1 ## Copyright (C) 2004 David Bateman | |
| 2 ## | |
| 3 ## This file is part of Octave. | |
| 4 ## | |
| 5 ## Octave is free software; you can redistribute it and/or modify it | |
| 6 ## under the terms of the GNU General Public License as published by | |
| 7 ## the Free Software Foundation; either version 2, or (at your option) | |
| 8 ## any later version. | |
| 9 ## | |
| 10 ## Octave is distributed in the hope that it will be useful, but | |
| 11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 ## General Public License for more details. | |
| 14 ## | |
| 15 ## You should have received a copy of the GNU General Public License | |
| 16 ## along with Octave; see the file COPYING. If not, write to the Free | |
| 17 ## Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
| 18 ## 02111-1307, USA. | |
| 19 | |
| 20 ## -*- texinfo -*- | |
| 21 ## @deftypefn {Function File} {} flipdim (@var{x}, @var{dim}) | |
| 22 ## Return a copy of @var{x} flipped about the dimension @var{dim}. | |
| 23 ## For exmaple | |
| 24 ## | |
| 25 ## @example | |
| 26 ## @group | |
| 27 ## flipdim ([1, 2; 3, 4], 2) | |
| 28 ## @result{} 2 1 | |
| 29 ## 4 3 | |
| 30 ## @end group | |
| 31 ## @end example | |
| 32 ## @end deftypefn | |
| 33 ## @seealso{fliplr, flipud, rot90 and rotdim} | |
| 34 | |
| 35 ## Author: David Bateman | |
| 36 | |
| 37 function y = flipdim (x, dim) | |
| 38 | |
| 39 if (nargin != 1 && nargin != 2) | |
| 40 usage ("flipdim (x, dim)"); | |
| 41 endif | |
| 42 | |
| 43 nd = ndims (x); | |
| 44 sz = size (x); | |
| 45 if (nargin == 1) | |
| 46 ## Find the first non-singleton dimension. | |
| 47 dim = 1; | |
| 48 while (dim < nd + 1 && sz(dim) == 1) | |
| 49 dim = dim + 1; | |
| 50 endwhile | |
| 51 if (dim > nd) | |
| 52 dim = 1; | |
| 53 endif | |
| 54 else | |
| 55 if (! (isscalar (dim) && dim == round (dim)) && dim > 0 && dim < (nd + 1)) | |
| 56 error ("flipdim: dim must be an integer and valid dimension"); | |
| 57 endif | |
| 58 endif | |
| 59 | |
| 60 idx = cell (); | |
| 61 for i = 1:nd | |
| 62 idx{i} = 1:sz(i); | |
| 63 endfor | |
| 64 idx{dim} = sz(dim):-1:1; | |
| 65 y = x(idx{:}); | |
| 66 | |
| 67 endfunction |