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## Copyright (C) 1998 John W. Eaton
##
## This program 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.
##
## This program 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 this file. If not, write to the Free Software Foundation,
## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
## usage: dot (x, y)
##
## Computes the dot product of two vectors.
## Author: jwe
function z = dot (x, y)
if (nargin != 2)
usage ("dot (x, y)");
endif
if (is_vector (x) && is_vector (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
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