title: 2D Sorting with NumPy - sort 1 row and have the other follow the sorting
body: <p>Say I have a NumPy array:</p>
  
  <pre><code>[[4 9 2]
   [5 1 3]]
  </code></pre>
  
  <p>I want to sort the bottom row of this array, but have the top row follow the sorting, such that I get:</p>
  
  <pre><code>[[9 2 4]
   [1 3 5]]
  </code></pre>
  
  <p>I know that you can sort like this using the sorted() function, but that requires input and output of lists.</p>
  
  <p>Any ideas? Thanks so much!</p>