 <span class="keyword">end</span>;
0417     <span class="keyword">if</span> (strcmp(varargin{na},<span class="string">'debug'</span>)) <span class="comment">% debug level.</span>
0418         debug = varargin{na+1};
0419         inc = 2;
0420     <span class="keyword">end</span>;
0421     <span class="keyword">if</span> (inc==0)
0422       disp(varargin{na});
0423       error(<span class="string">'Unknown Input Argument.'</span>);
0424     <span class="keyword">end</span>;
0425     na=na+inc;
0426