title: Print a STL Map as a table
body: <p>I have a map defined as <code>map&lt;string, vector&lt;double&gt; &gt;</code>.</p>
  
  <p>How do I print this as a table. I want the key of the map to be the title row of the table and the each column of the table will be the <code>vector</code></p>
  
  <p>Say my initial map was</p>
  
  <pre><code>hash = {
    "a": [1, 2, 3],
    "b": [1, 2, 3]
  }
  </code></pre>
  
  <p>I want this printed as</p>
  
  <pre><code>a b
  1 1
  2 2
  3 3
  </code></pre>