title: Memory optimisation
body: <p>I'm just curious to know if I can reduce memory usage of Matlab by using some option.
  Clicking on a variable in workspace shows a long digit which may not be necessary in most of cases. e.g.,</p>
  
  <pre><code>[20, 25.0540913632159, 16.2750000000000, 3.08852992798468];
  </code></pre>
  
  <p>for me <code>25.054091</code> may be more than ok. Are there any options that Matlab just reduce numbers for internal calculation and does it make any difference.  </p>