note 42003 added to ref.math

Please note that shorter is not always better (meaning that really short faculty implementation above). In my opinion, a clearer way to code this is, including a check for negative or non-integer values. In order to calculate the faculty of a positive integer, an iterative way (which might be harder to understand) is usually a bit faster, but I am using it only for small values so it is not really important to me: <?php // Calculate the Faculty of a positive int-value function iFaculty($a_iFac) { if ($a_iFac > 0) { return $a_iFac * $this->iFaculty($a_iFac - 1); } elseif ($a_iFac == 0) { return 1; } else { return 0; // Wrong argument! } } ?> I've also written another function to calculate the binomial coefficient of 2 values, I didn't find it anywhere yet so I hope it might help someone (works fine with the above stated faculty-function and ready to be used inside of your own classes!) <?php // calculates the binomial coefficient "n over k" of 2 positive int values // für n >= k function iBinCoeff($a_iN, $a_iK) { // the binomial coefficient is defined as n! / [ (n-k)! * k! ] return $this->iFaculty($a_iN) / ($this->iFaculty($a_iN - $a_iK) * $this->iFaculty($a_iK)); } ?> ---- Manual Page -- http://www.php.net/manual/en/ref.math.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+42003 Delete -- http://master.php.net/manage/user-notes.php?action=delete+42003&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+42003&report=yes Search -- http://master.php.net/manage/user-notes.php