Posted By

Scooter on 12/06/08


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math


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Summation


 / Published in: PHP
 

URL: http://reusablecode.blogspot.com/2008/12/summation.html

Summation using the Gauss method.

  1. <?php
  2. /*
  3.   Copyright (c) 2008, reusablecode.blogspot.com; some rights reserved.
  4.  
  5.   This work is licensed under the Creative Commons Attribution License. To view
  6.   a copy of this license, visit http://creativecommons.org/licenses/by/3.0/ or
  7.   send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California
  8.   94305, USA.
  9.   */
  10.  
  11. // Summation using the Gauss method
  12. function sum($x, $y)
  13. {
  14. return ($x + $y) * (($y - $x + 1) / 2);
  15. }
  16. ?>

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