| public static geometricMean ( array $numbers ) : number | ||
| $numbers | array | |
| 리턴 | number | |
public static function geometricMean(array $numbers)
{
if (empty($numbers)) {
return null;
}
$n = count($numbers);
return pow(array_reduce($numbers, function ($carry, $a) {
return !empty($carry) ? $carry * $a : $a;
}), 1 / $n);
}