title: How to interpret output of get.edgelist() in igraph
body: <p>I would like to know how to interpret the output of the <code>get.edgelist()</code> command in <code>igraph</code> in R.</p>
  
  <p>for example I generate a random graph:</p>
  
  <pre><code>a=erdos.renyi.game(100,0.5, directed=TRUE)
  a=get.edgelist(a)
  </code></pre>
  
  <p>This gives me two columns and I would think that the first one represents nodes and the second the corresponding connections. </p>
  
  <p>But this doesn't seem to be the case because some numbers are only represented in the second column but not the first. How can this be?</p>