title: Implementing Excel and VB's IRR function
body: <p>I need to port the <a href="http://en.wikipedia.org/wiki/Internal_rate_of_return" rel="noreferrer">IRR</a> function found in Excel and VB to ActionScript.</p>
  
  <ul>
  <li><a href="http://www.techonthenet.com/excel/formulas/irr.php" rel="noreferrer">Excel IRR formula</a></li>
  </ul>
  
  <p>Any idea how to find the "source" to such functions? does anyone have this implemented in some other c-like language?  </p>