        <p>Go to directory <tt>interfaces/PMI</tt>. We want to solve an optimization problem with constraints in the form of polynomial matrix inequalities. The problem is
            stored in a structure <tt>pmidata.mat</tt> in directory <tt>interfaces/PMI</tt>. The structure of the datafile is explained in Appendix PMI. All the user has to do to solve the problem is to call the following
            sequence of commands:
         </p><pre>load pmidata
penm=pmi_define(pmidata);
prob=penlab(penm);
prob.sol