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annotate scripts/general/flipdim.m @ 5018:1c65a8e44ef9 ss-2-1-59

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[project @ 2004-09-22 03:33:29 by jwe]
author jwe
date Wed, 22 Sep 2004 03:33:29 +0000
parents ed25bed43409
children c08cb1098afc
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1 ## Copyright (C) 2004 David Bateman
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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 2, or (at your option)
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8 ## 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, write to the Free
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17 ## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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18 ## 02111-1307, USA.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} flipdim (@var{x}, @var{dim})
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22 ## Return a copy of @var{x} flipped about the dimension @var{dim}.
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23 ## For example
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24 ##
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25 ## @example
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26 ## @group
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27 ## flipdim ([1, 2; 3, 4], 2)
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28 ## @result{} 2 1
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29 ## 4 3
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30 ## @end group
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31 ## @end example
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32 ## @end deftypefn
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33 ## @seealso{fliplr, flipud, rot90 and rotdim}
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34
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35 ## Author: David Bateman
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36
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37 function y = flipdim (x, dim)
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38
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39 if (nargin != 1 && nargin != 2)
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40 usage ("flipdim (x, dim)");
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41 endif
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42
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43 nd = ndims (x);
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44 sz = size (x);
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45 if (nargin == 1)
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46 ## Find the first non-singleton dimension.
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47 dim = 1;
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48 while (dim < nd + 1 && sz(dim) == 1)
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49 dim = dim + 1;
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50 endwhile
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51 if (dim > nd)
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52 dim = 1;
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53 endif
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54 else
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55 if (! (isscalar (dim) && dim == round (dim)) && dim > 0 && dim < (nd + 1))
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56 error ("flipdim: dim must be an integer and valid dimension");
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57 endif
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58 endif
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59
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60 idx = cell ();
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61 for i = 1:nd
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62 idx{i} = 1:sz(i);
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63 endfor
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64 idx{dim} = sz(dim):-1:1;
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65 y = x(idx{:});
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66
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67 endfunction