illustrate by example how to declare and use indexed dual
variables. Consider the following semidefinite program from the
<a class="reference external" href="http://sedumi.ie.lehigh.edu">SeDuMi</a> examples:</p>
<div class="math">
\[\begin{split}\begin{array}{ll}
        \text{minimize} &amp; \sum_{i=1}^n (n-i) X_{ii} \\
        \text{subject to} &amp; \sum_{i=1}^n X_{i,i+k} = b_k, ~ k = 1,2,\dots,n \\
        &amp; X \succeq 0
\end{array}\end{split}\]</div>
<p>This problem minimizes a weighted sum of the m