is has one element for every edge in the matrix</p></td>
    </tr>
    <tr>
      <th>dvect</th>
      <td><p>A numeric vector. The original distance between adjacent nodes, this has one element for every edge in the matrix</p></td>
    </tr>
    <tr>
      <th>kvect</th>
      <td><p>A numeric vector. The vector of spring coefficients between connected nodes, this has one element for every edge in the matrix</p></td>
    </tr>
    <tr>
      <th>non_empty_index</th>
      <td><p>non_empty_matrix A numeric 