| public static rootMeanSquare ( array $numbers ) : number | ||
| $numbers | array | |
| Результат | number | |
public static function rootMeanSquare(array $numbers)
{
$x₁²＋x₂²＋⋯ = array_sum(array_map(function ($x) {
return $x ** 2;
}, $numbers));
$n = count($numbers);
return sqrt($x₁²＋x₂²＋⋯ / $n);
}