title: Writing multiple seperate numpy arrays to a single comma delimited text file
body: <p>I would like to take multiple numpy arrays and write them to a text file that is comma delimited.  Here is the example of my original data and the final data that I am trying to produce:</p>
  
  <pre><code>array([[1., 3., 0., 1.],
         [2., 5., 3., 1.]].....
  </code></pre>
  
  <p>and so forth.  For multiple different arrays of four-column lengths.  I can get an out put txt file using write() but I can't get the data into the format shown below:</p>
  
  <pre><code>1., 3., 0., 1.
  2., 5., 3., 1.
  </code></pre>
  
  <p>Also, I need to have the 0th column integers and the 1st through 3rd be floating point.</p>
  
  <p>Cheers.</p>