title: numpy, named columns
body: <p>Simple question about <em>numpy</em>:</p>
  
  <p>I load 100 values to a vector <code>a</code>. From this vector, I want to create an array <code>A</code> with 2 columns, where one column has name "C1" and second one "C2", one has type <code>int32</code> and another <code>int64</code>. An example:</p>
  
  <pre><code>a = range(100)
  A = array(a).reshape( len(a)/2, 2)
  # A.dtype = ...?
  </code></pre>
  
  <p>How to define the columns' types and names, when I create array from <code>a</code>?</p>