note 110694 added to function.stats-cdf-poisson
| From: | s at nder dot com | Date: | Fri, 23 Nov 2012 09:33:55 +0000 |
| Subject: | note 110694 added to function.stats-cdf-poisson | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-192117@lists.php.net to get a copy of this message | ||
A simple poisson-distribution function, which only works for relatively small numbers (maximum of
~100/100 for most systems):
<?php
function factorial($number)
{
if ($number < 2) {
return 1;
} else {
return ($number * factorial($number-1));
}
}
function poisson($chance, $occurrence)
{
$e = exp(1);
$a = pow($e, (-1 * $chance));
$b = pow($chance,$occurrence);
$c = factorial($occurrence);
return $a * $b / $c;
}
$test = poisson(100,100);
echo $test . "\n";
?>
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Server IP: 69.147.83.199
Probable Submitter: 139.63.57.59
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Manual Page -- http://www.php.net/manual/en/function.stats-cdf-poisson.php
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