MathPHP\Functions\Map\Multi::multiply PHP Метод

    public static function multiply(array ...$arrays) : array
    {
        self::checkArrayLengths($arrays);
        $number_of_arrays = count($arrays);
        $length_of_arrays = count($arrays[0]);
        $products = array_fill(0, $length_of_arrays, 1);
        for ($i = 0; $i < $length_of_arrays; $i++) {
            for ($j = 0; $j < $number_of_arrays; $j++) {
                $products[$i] *= $arrays[$j][$i];
            }
        }
        return $products;
    }

 /**
  * Weighted n-point moving average (WMA)
  *
  * Similar to simple n-point moving average,
  * however, each n-point has a weight associated with it,
  * and instead of dividing by n, we divide by the sum of the weights.
  *
  * Each weighted average = ∑(weighted values) / ∑(weights)
  *
  * @param  array  $numbers
  * @param  int    $n       n-point moving average
  * @param  array  $weights Weights for each n points
  *
  * @return array of averages
  *
  * @throws BadDataException if number of weights is not equal to number of n-points
  */
 public static function weightedMovingAverage(array $numbers, int $n, array $weights) : array
 {
     if (count($weights) !== $n) {
         throw new Exception\BadDataException('Number of weights must equal number of n-points');
     }
     $m = count($numbers);
     $∑w = array_sum($weights);
     $WMA = [];
     for ($i = 0; $i <= $m - $n; $i++) {
         $∑wp = array_sum(Map\Multi::multiply(array_slice($numbers, $i, $n), $weights));
         $WMA[] = $∑wp / $∑w;
     }
     return $WMA;
 }