title: Vertex Labels in igraph with R
body: <p>I have some issue while adding vertex labels in a weighted igraph working with R.</p>
  
  <p>The data frame of the graph is:</p>
  
  <pre><code>df &lt;- read.table(text=
      "From, To, Weight
      A,B,1
      B,C,2
      B,F,3
      C,D,5
      B,F,4
      C,D,6
      D,E,7
      E,B,8
      E,B,9
      E,C,10
      E,F,11", sep=',',header=TRUE)
  
  #    From To Weight
  # 1     A  B      1 
  # 2     B  C      2
  # 3     B  F      3
  # 4     C  D      5
  # 5     B  F      4
  # 6     C  D      6
  # 7     D  E      7
  # 8     E  B      8
  # 9     E  B      9
  # 10    E  C     10
  # 11    E  F     11
  </code></pre>
  
  <p>and I use :</p>
  
  <pre><code>g&lt;-graph.data.frame(df,directed = TRUE)
  plot(g)
  </code></pre>
  
  <p>to plot the following graph :</p>
  
  <p><img src="https://i.stack.imgur.com/rdGgM.png" alt="enter image description here"></p>
  
  <p>One can see that vertex labels (for example) from E to B are superimposed.
  (The same problem appears for vertex C-D and vertex B-F)</p>
  
  <p>I'd like to know how to separate these labels so as to have each
  different weight on each vertex ?</p>