note 99857 deleted from function.rand by danbrown
| From: | danbrown@php.net | Date: | Fri, 10 Sep 2010 21:23:56 +0000 |
| Subject: | note 99857 deleted from function.rand by danbrown | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-172464@lists.php.net to get a copy of this message | ||
Note Submitter: Alireza Eliaderani
----
random integers with normal distribution,
it's not scientifically approved, but worked for me.
<?php
/*
* @param number $mean, desired average
* @param number $sd, number of items in array
* @return array
*/
function distribute($mean,$sd){
$result = array();
$total_mean = intval($mean*$sd);
while($sd>1){
$allowed_max = $total_mean - $sd - 1;
$allowed_min = intval($total_mean/$sd);
$random = mt_rand($allowed_min , min(5,$allowed_max));
$result[]=$random;
$sd--;
$total_mean-=$random;
}
$result[] = $total_mean;
return $result;
}
?>