t and returns its 'L' packed representation
            i.e., a dense vector of length <tt>n*(n+1)/2</tt> set up by columns of the lower triangle of the input matrix..
         </p>
         <p><b><tt>testmex</tt></b> tests whether the behaviour of all the mex files is correct.
         </p>
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         <h2>Examples<a name="11"></a></h2>
         <p><b>Example 1</b> Consider the following nonlinear optimization problem
         </p>
        