title: how to use Graphviz to draw a node pointed by an arrow?
body: <p>I use dot language to draw a simple graph which contains only one node and an edge point to this node. I came up with a way to do so:</p>
  
  <pre><code>digraph dot {
  
      n0 [label= "", shape=none]
  
      n0 -&gt; n1
  
  }
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/VUaWX.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/VUaWX.jpg" alt="enter image description here"></a></p>
  
  <p>This implementation create a blank in the top of graph. So how to remove this blank? In other words, are there any better implementation?</p>