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## Copyright (C) 2004-2013 David Bateman
## Copyright (C) 2009 VZLU Prague
##
## 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
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {} flipdim (@var{x})
## @deftypefnx {Function File} {} flipdim (@var{x}, @var{dim})
## Return a copy of @var{x} flipped about the dimension @var{dim}.
## @var{dim} defaults to the first non-singleton dimension.
## For example:
##
## @example
## @group
## flipdim ([1, 2; 3, 4], 2)
## @result{} 2 1
## 4 3
## @end group
## @end example
## @seealso{fliplr, flipud, rot90, rotdim}
## @end deftypefn
## Author: David Bateman, Jaroslav Hajek
function y = flipdim (x, dim)
if (nargin != 1 && nargin != 2)
print_usage ();
endif
nd = ndims (x);
sz = size (x);
if (nargin == 1)
## Find the first non-singleton dimension.
(dim = find (sz > 1, 1)) || (dim = 1);
elseif (! (isscalar (dim) && isindex (dim)))
error ("flipdim: DIM must be a positive integer");
endif
idx(1:max(nd, dim)) = {':'};
idx{dim} = size (x, dim):-1:1;
y = x(idx{:});
endfunction
%!assert (flipdim ([1,2;3,4]), flipdim ([1,2 ; 3,4], 1))
%!assert (flipdim ([1,2;3,4], 2), [2,1;4,3])
%!assert (flipdim ([1,2;3,4], 3), [1,2;3,4])
## FIXME -- we need tests for multidimensional arrays.
%!error flipdim ()
%!error flipdim (1, 2, 3)
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