title: savetxt two columns in python,numpy
body: <p>I have some data as numpy 2D array list- </p>
  
  <pre><code>array([[ 0.62367947],
         [ 0.95427859],
         [ 0.97984112],
         [ 0.7025228 ],
         [ 0.86436385],
         [ 0.71010739],
         [ 0.98748138],
         [ 0.75198057]])
  
  array([[-1.,  1., -1.],    
         [-1.,  1.,  1.],
         [ 1.,  1.,  1.],
         [ 1., -1.,  1.],
         [-1., -1., -1.],
         [ 1.,  1., -1.],
         [ 1., -1., -1.],
         [-1., -1.,  1.]])
  </code></pre>
  
  <p>And I want to save them in a txt file so that they look like </p>
  
  <pre><code>0.62367947    -1 1 -1    
  0.95427859    -1 1 1    
  0.97984112     1 1 1
  </code></pre>
  
  <p>Can someone help me how I can do it using numpy savetxt</p>