not defined. If not present, the elements are unconstrained.
               </li>
            </ul>
         </div><pre> penm.lbYx=cell(3,1); penm.lbYx{2}=-ones(3,3); penm.lbYx{3}=zeros(5,5);
 penm.ubYx=cell(3,1); penm.ubYx{2}=ones(3,3) ;</pre><div>
            <ul>
               <li><b>lower and upper bound on matrices <tt>Y</tt></b> (as matrix inequalities, i.e.   bound on all eigenvalues).
               </li>
            </ul>
         </div><pre> penm.lbY = [0, -Inf, 1];
 penm.ubY = [Inf, 0, 10];</pre