sc" /></colgroup>
    <tr>
      <th>x</th>
      <td><p><code>mrfi</code> object.</p></td>
    </tr>
    <tr>
      <th>i</th>
      <td><p>vector of indexes to extract interacting positions.</p></td>
    </tr>
    </table>

    <h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2>

    <p><code>[[</code>: converts to list and subsets it.</p>
<p><code>[</code>: subsets the <code>mrfi</code> object and returns another <code>mrfi</code> object.</p>
<p><code>+</code>: computes the un