on the elements of the matrix variables</b> only elements matching patterns of <tt>Y{}</tt> will be taken into account if the matrix is empty (<tt>[]</tt>) it is automatically considered as <tt>+/-Inf</tt> accordingly
               </li>
            </ul>
         </div><pre> penm.lbYx{1} = - magic(3);
 penm.ubYx{1} = magic(3);
 penm.lbYx{2} = sparse(5,5);
 penm.ubYx{3} = 100;</pre><p><b>Starting point</b></p>
         <p>is an optional input. When set, it should be ideally feasible. For a matrix variable 