title: Matlab: Plot points and make them clickable to display informations about it
body: <p>I have some points like this:</p>
  
  <pre><code>matrix = rand(6, 4)
  0.8147    0.2785    0.9572    0.7922
  0.9058    0.5469    0.4854    0.9595
  0.1270    0.9575    0.8003    0.6557
  0.9134    0.9649    0.1419    0.0357
  0.6324    0.1576    0.4218    0.8491
  0.0975    0.9706    0.9157    0.9340
  </code></pre>
  
  <p>the first two columns are x and y values which get plotted as points via</p>
  
  <p><code>plot(matrix(:, 1), matrix(:, 2), '*r'</code></p>
  
  <p>Now what I want to work out is the following:
  Whenever I click on a certain point in the plot, I want the information out of column 3 and 4 being displayed as text just right of the point in a box, e.g. with some text, e.g.
  <code>information 1: VALUE_COL3, information 2: VALUE_COL4</code>. How to achieve that? I thought of the <code>ButtonDownFcn</code> attribute and than check out the clicked point and match it. But is there any easier way to do it?</p>
  
  <p>Thanks!</p>