title: How to convert values in specific column into integer type under numpy matrix
body: <p>How can I convert the <strong>second</strong> column of this matrix into <code>int</code> type <em>inplace</em>?</p>
  
  <pre><code>import numpy as np
  x = np.array([[1.23e+02, 2.3], [1.3e+01, 2.9],[1.2e+01, 83.3]])
  </code></pre>
  
  <p>Desired output:</p>
  
  <pre><code>array([[ 123. ,    2],
         [  13. ,    2],
         [  12. ,   83]])
  </code></pre>
  
  <p>The best I can come out with is this, but not inlace</p>
  
  <pre><code>x[:,1].astype(int)
  </code></pre>