function r = polymul(p, q)
%POLYMUL Multiply polynomials.
%
%   R = POLYMUL(P, Q) multiplies the polynomials whose coefficients are
%   the elements of the vectors P and Q.
%
%   POLYMUL is essentially a call to CONV.
%
%   See also POLYADD, POLYSUB, POLYDIV, POLYPOW, CONV.

%   Author:      Peter John Acklam
%   Time-stamp:  2004-09-22 21:03:16 +0200
%   E-mail:      pjacklam@online.no
%   URL:         http://home.online.no/~pjacklam

   % Check number of input arguments.
   error(nargchk(2, 2, nargin));

   % Check array class.
   if ~isnumeric(p) || ~isnumeric(q)
      error('P and Q must be numeric arrays.');
   end

   % Check array size.
   if (ndims(p) ~= 2) || (size(p, 1) ~= 1) || ...
      (ndims(q) ~= 2) || (size(q, 1) ~= 1)
      error('P and Q must be row vectors.');
   end

   r = conv(p, q);