title: Numpy minimum in (row, column) format
body: <p>How can I know the (row, column) index of the minimum of a numpy array/matrix?</p>
  
  <p>For example, if <code>A = array([[1, 2], [3, 0]])</code>, I want to get <code>(1, 1)</code></p>
  
  <p>Thanks!</p>