## Copyright (C) 2005-2013 William Poetra Yoga Hadisoeseno
##
## 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} {} isequal (@var{x1}, @var{x2}, @dots{})
## Return true if all of @var{x1}, @var{x2}, @dots{} are equal.
## @seealso{isequaln}
## @end deftypefn

function retval = isequal (x1, varargin)

  if (nargin < 2)
    print_usage ();
  endif

  retval = __isequal__ (false, x1, varargin{:});

endfunction


## test size and shape
%!assert (isequal ([1,2,3,4],[1,2,3,4]), true)
%!assert (isequal ([1;2;3;4],[1;2;3;4]), true)
%!assert (isequal ([1,2,3,4],[1;2;3;4]), false)
%!assert (isequal ([1,2,3,4],[1,2;3,4]), false)
%!assert (isequal ([1,2,3,4],[1,3;2,4]), false)

%!test
%! A = 1:8;
%! B = reshape (A, 2, 2, 2);
%! assert (isequal (A, B), false);

%!test
%! A = reshape (1:8, 2, 2, 2);
%! B = A;
%! assert (isequal (A, B), true);

%!test
%! A = reshape (1:8, 2, 4);
%! B = reshape (A, 2, 2, 2);
%! assert (isequal (A, B), false);

## test for equality
%!assert (isequal ([1,2,3,4],[1,2,3,4]), true)
%!assert (isequal (['a','b','c','d'],['a','b','c','d']), true)
## Test multi-line strings
%!assert (isequal (["test";"strings"],["test";"strings"],["test";"strings"]), true)
## test for inequality
%!assert (isequal ([1,2,3,4],[1;2;3;4]), false)
%!assert (isequal ({1,2,3,4},[1,2,3,4]), false)
%!assert (isequal ([1,2,3,4],{1,2,3,4}), false)
%!assert (isequal ([1,2,NaN,4],[1,2,NaN,4]), false)
%!assert (isequal (['a','b','c','d'],['a';'b';'c';'d']), false)
%!assert (isequal ({'a','b','c','d'},{'a';'b';'c';'d'}), false)
## test for equality (struct)
%!assert (isequal (struct ('a',1,'b',2),struct ('a',1,'b',2)), true)
%!assert (isequal (struct ('a',1,'b',2),struct ('a',1,'b',2),struct ('a',1,'b',2)), true)
%!assert (isequal (struct ('a',"abc",'b',2),struct ('a',"abc",'b',2)), true)
## test for inequality (struct)
%!assert (isequal (struct ('a',NaN,'b',2),struct ('a',NaN,'b',2),struct ('a',NaN,'b',2)), false)

## test for sparse matrices
%!assert (isequal (sparse (0,1), sparse (0,1)), true)
%!assert (isequal (sparse (0,1), sparse (1,0)), false)
%!assert (isequal (sparse (2, 2), sparse (2, 2)), true)

## Input validation
%!error isequal ()
%!error isequal (1)