title: How to return all the minimum indices in numpy
body: <p>I am a little bit confused reading the documentation of <a href="http://docs.scipy.org/doc/numpy/reference/generated/numpy.argmin.html" rel="noreferrer">argmin function in numpy</a>.
  It looks like it should do the job: </p>
  
  <p>Reading this</p>
  
  <blockquote>
    <p>Return the indices of the minimum values along an axis.</p>
  </blockquote>
  
  <p>I might assume that </p>
  
  <pre><code>np.argmin([5, 3, 2, 1, 1, 1, 6, 1])
  </code></pre>
  
  <p>will return an array of all indices: which will be <code>[3, 4, 5, 7]</code></p>
  
  <p>But instead of this it returns only <code>3</code>. Where is the catch, or what should I do to get my result?</p>