title: Create dictionary from two numpy arrays
body: <p>I have the following two numpy arrays:</p>
  
  <pre><code>a = array([400., 403., 406.]);
  b = array([0.2,0.55,0.6]);
  </code></pre>
  
  <p>Now I would like to create a dictionary where the array a acts as keys and b as corresponding values:</p>
  
  <pre><code>dic = { 
    400: 0.2,
    403: 0.55,
    406: 0.6
  }
  </code></pre>
  
  <p>How could I achieve this ?</p>