title: Numpy.savetxt() function
body: <p>I have a table with several columns and want save it with </p>
  
  <pre><code>numpy.savetxt('test.txt', test, fmt='%f')
  </code></pre>
  
  <p>I want save only the last column in float format, all other columns should be integers... For example</p>
  
  <pre><code>1 1 1 0.5
  1 2 2 0.3
  . . .  .
  </code></pre>
  
  <p>How I can enlarge my savetxt function or use some alternative? Thank you in advance!</p>