title: Fill bounded area under curve
body: <p>Say I have a plot in Matlab:</p>
  
  <pre><code>x=-10:0.1:10;
  plot(normpdf(x, 0, 3));
  </code></pre>
  
  <p>I would like to fill the area under the curve from <code>-4 &lt; x &lt; 4</code>. Similar question: If I for example wanted to fill the area to left of the curve from <code>0.04 &lt; y &lt; 0.1</code>?</p>