title: How to extract the sequence of the edges responsible for the diameter in a igraph object in R?
body: <p>Say a have an <code>igraph</code> object:</p>
  
  <pre><code>library(igraph)
  library(igraphdata)
  data(karate)
  
  
  get_diameter(karate)
  + 6/34 vertices, named, from 4b458a1:
  [1] Actor 16 John A   Actor 20 Mr Hi    Actor 6  Actor 17
  farthest_vertices(karate)
  $vertices
  + 2/34 vertices, named, from 4b458a1:
  [1] Actor 16 Actor 17
  
  $distance
  [1] 13
  </code></pre>
  
  <p>I have easily found the vertices that are the farthest apart from each other. How do I extract the edges sequence that connects the vertices <strong>Actor 16</strong> to <strong>Actor 17</strong>?</p>