title: Matlab get string containing variable name
body: <p>In Matlab, how can i get a String containing <code>"GRUMPY"</code> given the following declaration:</p>
  
  <pre><code>  GRUMPY = 500;
  </code></pre>
  
  <p>This is usually called reflection in other programming languages, but i cannot find an example of it in Matlab.</p>