title: how to add tex to octave graph
body: <p>I have a bar graph, and I am using text() to display fractions above each of the bars.  For example:</p>
  
  <pre><code>text(1, 20, "300/400")
  </code></pre>
  
  <p>displays the string "300/400" at position (1,20).</p>
  
  <p>I would now like to prettify the fractions so that "300" appears <em>over</em> the "400":  </p>
  
  <pre><code>300
  ---
  400
  </code></pre>
  
  <p>Is there a way to do this, eg with tex or latex?</p>
  
  <p>I tried each of these, but the interpreter is not getting called:</p>
  
  <pre><code>text(1, 20, '\frac{300}{400}');
  text(1, 20, '\frac{300}{400}', 'interpreter', 'tex');
  text(1, 20, '\frac{300}{400}', 'interpreter', 'latex');
  </code></pre>