title: Matlab multiple graph types inside one graph
body: <p>I have a task to draw electrostatic field between<br>
  two electrodes( at given sizes and shape ),<br/>
  what i have now is that i draw the electrodes with area plot (area(elect_x,elect_y))<br>
  the graph looks like this:</p>
  
  <pre><code>------------------.---
                    |..
       .---.        |..
       |...|        |..
  .----....|        |..
  |........|        |..
  ----------------------
  </code></pre>
  
  <p>and now i would need to draw inside this probably a mesh, showing the field.<br>
  Is there any way to do it, or i´m on a wrong way?<br>
  Thank you very much for every guide</p>