title: How to combine two specific cells using a comma separation in R
body: <p>I have the following data set</p>
  <p><img src="https://i.stack.imgur.com/ChZXm.png" alt="Data that needs combining" /></p>
  <p>I'd like it such that cell [2,6] retains its current content with the addition of the cell below it, separated by a &quot;,&quot; I have found <code>paste()</code> functions for concatenating columns into new columns but can't find an answer for specific cell combinations. Any help appreciated.</p>
  <p><img src="https://i.stack.imgur.com/Yql7i.png" alt="Example" /></p>
  <p>For example, I'd like the highlighted cell in the above to read <code>John, Mary</code></p>