## Copyright (C) 1996-2012 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} {} isvector (@var{x})
## Return true if @var{x} is a vector.  A vector is a 2-D array
## where one of the dimensions is equal to 1.  As a consequence a
## 1x1 array, or scalar, is also a vector.
## @seealso{isscalar, ismatrix, size, rows, columns, length}
## @end deftypefn

## Author: jwe

function retval = isvector (x)

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

  sz = size (x);
  retval = (ndims (x) == 2 && (sz(1) == 1 || sz(2) == 1));

endfunction


%!assert (isvector (1))
%!assert (isvector ([1; 2; 3]))
%!assert (isvector ([]), false)
%!assert (isvector ([1, 2; 3, 4]), false)

%!assert (isvector ("t"))
%!assert (isvector ("test"))
%!assert (isvector (["test"; "ing"]), false)

%!test
%! s.a = 1;
%! assert (isvector (s));

%% Test input validation
%!error isvector ()
%!error isvector ([1, 2], 2)