rd">end</span>;
0307     <span class="keyword">end</span>
0308     <span class="keyword">if</span> (strcmp(varargin{na},<span class="string">'base'</span>)) <span class="comment">% numeric vector, n*1 or 1*1.</span>
0309         base = double(varargin{na+1});
0310         <span class="keyword">if</span> (length(base)==1); base = base*ones(n,1); <span class="keyword">end</span>;
0311         inc = 2;
0312     <span class="keyword">end</span>
0313     <span class="keyword">if</span> (strcmp(varargin{na