## Copyright (C) 1993-2012 John W. Eaton
##
## 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} {} fliplr (@var{x})
## Return a copy of @var{x} with the order of the columns reversed.  In
## other words, @var{x} is flipped left-to-right about a vertical axis.  For
## example:
##
## @example
## @group
## fliplr ([1, 2; 3, 4])
##      @result{}  2  1
##          4  3
## @end group
## @end example
##
## Note that @code{fliplr} only works with 2-D arrays.  To flip N-D arrays
## use @code{flipdim} instead.
## @seealso{flipud, flipdim, rot90, rotdim}
## @end deftypefn

## Author: jwe

function y = fliplr (x)

  if (nargin != 1)
    print_usage ();
  endif

  if (ndims (x) > 2)
    error ("fliplr: Only works with 2-D arrays");
  endif

  nc = columns (x);
  y = x (:, nc:-1:1);

endfunction


%!assert (fliplr ([1, 2; 3, 4]), [2, 1; 4, 3])
%!assert (fliplr ([1, 2; 3, 4; 5, 6]), [2, 1; 4, 3; 6, 5])
%!assert (fliplr ([1, 2, 3; 4, 5, 6]), [3, 2, 1; 6, 5, 4])

%!error fliplr()
%!error fliplr (1, 2)