<p>character, name for new column to record which columns values were taken from.</p></td>
    </tr>
    <tr>
      <th>value</th>
      <td><p>character, name for new column to record values.</p></td>
    </tr>
    <tr>
      <th>columns</th>
      <td><p>character, names of columns to take values from.</p></td>
    </tr>
    <tr>
      <th>na.rm</th>
      <td><p>passed to gather.</p></td>
    </tr>
    <tr>
      <th>convert</th>
      <td><p>passed to gather.</p></td>
    </tr>
    <tr>
      <th>factor