title: I have lists as column-values. How do I get each list item into its own row?
body: <p>I have a data frame in R that looks like this:</p>
  <div class="s-table-container">
  <table class="s-table">
  <thead>
  <tr>
  <th style="text-align: left;">Column 1</th>
  <th style="text-align: center;">Column 2</th>
  <th style="text-align: center;">Column 3</th>
  <th style="text-align: center;">Column 4</th>
  </tr>
  </thead>
  <tbody>
  <tr>
  <td style="text-align: left;">c(x,y)</td>
  <td style="text-align: center;">c(a,b)</td>
  <td style="text-align: center;">qwert</td>
  <td style="text-align: center;">character(0)</td>
  </tr>
  </tbody>
  </table>
  </div>
  <p>I want to unlist the data frame so that the new one looks like:</p>
  <div class="s-table-container">
  <table class="s-table">
  <thead>
  <tr>
  <th style="text-align: left;">Column 1</th>
  <th style="text-align: center;">Column 2</th>
  <th style="text-align: center;">Column 3</th>
  <th style="text-align: center;">Column 4</th>
  </tr>
  </thead>
  <tbody>
  <tr>
  <td style="text-align: left;">x</td>
  <td style="text-align: center;">a</td>
  <td style="text-align: center;">qwert</td>
  <td style="text-align: center;">N/A</td>
  </tr>
  <tr>
  <td style="text-align: left;">y</td>
  <td style="text-align: center;">b</td>
  <td style="text-align: center;">N/A</td>
  <td style="text-align: center;">N/A</td>
  </tr>
  </tbody>
  </table>
  </div>
  <p>I have tried using <code>separate_rows</code> but it comes back with <code>Error: Incompatible lengths</code></p>