title: Plotting convergence of points on top of a contour plot in Python
body: <p>I have made a contour plot in Python for an optimization algorithm. Now, I am having trouble plotting the iterative points in Python. My (x,y) points are stored as vectors within an array. Here is an example of such:</p>
  
  <p><code>[array([-1, -2]),
   array([ 0.93396226, -0.45283019]),
   array([2.86792453, 1.09433962]),...]</code></p>
  
  <p>How could I plot each of these points on top of my existing contour plot using matplotlib?</p>
  
  <p>Further explanation: I have this array of arrays. They represent x- and y-coordinates. I want to put these (x,y) coordinates on top of my contour plot.</p>