title: Minimum and maximum of a serie of points
body: <p>I have to write a function which take the coordinates of n points and returns the minimum and the maximum of abscissa and ordinate </p>
  
  <p>For exemple : </p>
  
  <pre><code>A = np.array([1,2])
  B = np.array([5,-1])
  C = np.array([2,4])
  t=[A,B,C]
  print(limits(t))
  </code></pre>
  
  <p>Return : </p>
  
  <pre><code>(1,5,-1,4)
  </code></pre>
  
  <p>I was thinking to create a loop which takes x values and y values and then just with a simple if we can find the max and min, but I dont how to write it..</p>