## Copyright (C) 1996, 1997 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 2, 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, write to the Free
## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
## 02111-1307, USA.

## -*- texinfo -*-
## @deftypefn {Function File} {} is_vector (@var{a})
## Return 1 if @var{a} is a vector.  Otherwise, return 0.
## @end deftypefn
## @seealso{size, rows, columns, length, is_scalar, and is_matrix}

## Author: jwe

function retval = is_vector (x)

  retval = 0;

  if (nargin == 1)
    if (is_matrix (x))
      [nr, nc] = size (x);
      retval = ((nr == 1 && nc >= 1) || (nc == 1 && nr >= 1));
    endif
  else
    usage ("is_vector (x)");
  endif

endfunction