lass="programlisting"> R1 = Polyhedron([0 0; 2 0; 0 1; 2 1]); </pre>
<pre class="programlisting"></pre>
<pre class="programlisting"> R2 = Polyhedron([1 0; 2 0; 1 -1; 2 -1]); </pre>
<pre class="programlisting"></pre>
<pre class="programlisting"> R3 = Polyhedron([2 0; 3 0; 2 -1; 3 -1]); </pre>
<pre class="programlisting"></pre> Plot the polyhedrons to see that they are touching themself.<pre class="programlisting"> plot([R1 R2 R3], 'showindex', true) </pre>
<pre class="programlisting"></pre>
<p class="program