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PermMatrix.cc (operator*): fix mixed row/column case
author John W. Eaton <jwe@octave.org>
date Sun, 06 Feb 2011 05:50:49 -0500
parents fd0a3ac60b0e
children 9493880928c8
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1 ## Copyright (C) 2004-2011 David Bateman
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2 ## Copyright (C) 2009 VZLU Prague
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} flipdim (@var{x})
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22 ## @deftypefnx {Function File} {} flipdim (@var{x}, @var{dim})
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23 ## Return a copy of @var{x} flipped about the dimension @var{dim}.
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24 ## @var{dim} defaults to the first non-singleton dimension.
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25 ## For example:
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26 ##
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27 ## @example
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28 ## @group
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29 ## flipdim ([1, 2; 3, 4], 2)
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30 ## @result{} 2 1
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31 ## 4 3
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32 ## @end group
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33 ## @end example
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34 ## @seealso{fliplr, flipud, rot90, rotdim}
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35 ## @end deftypefn
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36
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37 ## Author: David Bateman, Jaroslav Hajek
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38
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39 function y = flipdim (x, dim)
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40
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41 if (nargin != 1 && nargin != 2)
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42 print_usage ();
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43 endif
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44
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45 nd = ndims (x);
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46 if (nargin == 1)
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47 ## Find the first non-singleton dimension.
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48 [~, dim] = min (size (x) != 1);
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49 elseif (! (isscalar (dim) && isindex (dim)))
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50 error ("flipdim: DIM must be a positive integer");
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51 endif
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52
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53 idx(1:max(nd, dim)) = {':'};
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54 idx{dim} = size (x, dim):-1:1;
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55 y = x(idx{:});
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56
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57 endfunction