t>penm</tt>. Examples how to generate it are below or in directory <tt>penlab\examples</tt>.
         </p><pre>problem = penlab(penm);</pre><p><html><a  href="#top_of_page">Back to Top</a> </html></p>
         <h2>Elements of the penm structure<a name="5"></a></h2>
         <p><b>IMPORTANT NOTE</b></p>
         <p>Whenever matrix variables <tt>Y{1}, Y{2}, ..., Y{NY}</tt> are present, they will be vectorized. All elements of this new vector will be counted with indices starting with <tt>(Nx+1)</tt> (<tt>Nx</