<span class="string">'At least one input argument required'</span> );
0243 <span class="keyword">end</span>
0244 
0245 xdata = double(varargin{1});
0246 d = size(xdata,2);
0247 n = size(xdata,1);
0248 <span class="keyword">if</span> ((nargin&gt;1) &amp;&amp; (~ischar(varargin{2})))
0249   ydata = double(varargin{2});
0250   <span class="keyword">if</span> (any(size(ydata) ~= [n 1])); error(<span class="string">'y must be n*1 column vector'</span>); <span class="keyword">end</span>;
0251   family = 