truct(<span class="string">'name'</span>,varargin{na+1}, <span class="string">'directory'</span>,<span class="string">''</span>, <span class="string">'parameters'</span>,0 );
0395         inc = 2;
0396     <span class="keyword">end</span>;
0397     <span class="keyword">if</span> (strcmp(varargin{na},<span class="string">'maxk'</span>)) <span class="comment">% positive integer.</span>
0398         maxk = varargin{na+1};
0399         inc = 2;
0400     <span class="keyword">end</span>;
0401     <span c