## Copyright (C) 1998 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} {} dot (@var{x}, @var{y})
## Computes the dot product of two vectors.
## @end deftypefn

## Author: jwe

function z = dot (x, y)

  if (nargin != 2)
    usage ("dot (x, y)");
  endif

  if (isvector (x) && isvector (y) && length (x) == length (y))
    [x_nr, x_nc] = size (x);
    [y_nr, y_nc] = size (y);
    if (x_nr == 1)
      if (y_nr == 1)
        z = x * y.';
      else
        z = x * y;
      endif
    else
      if (y_nr == 1)
        z = y * x;
      else
        z = y.' * x;
      endif
    endif
  else
    error ("dot: both arguments must be vectors of the same length");
  endif

endfunction