el Grant - 3/8/06</span>
<span class="comment">%</span>
<span class="comment">% We optimize a tri-state bus connecting six nodes ( The model for the bus</span>
<span class="comment">% is shown in the paper, fig.16). The total wire area is sum_{i&gt;j} lij*xij</span>
<span class="comment">% The bus can be driven from any node. When node i drives the bus, the ith</span>
<span class="comment">% switch is closed and the others are all open. Thus we really have six</span>
<span class="comment">% different circui