Корреляция функции с 10 переменными

double corr(double *a, double *b, int n) {
  double sum_a = 0.0, sum_b = 0.0;
  for (int i = 0; i < n; i++) {
    sum_a += a[i];
    sum_b += b[i];
  }
  double avg_a = sum_a / n;
  double avg_b = sum_b / n;
  double cov = 0.0, v_a = 0.0, v_b = 0.0;
  for (int i = 0; i < n; i++) {
    double diff_a = a[i] - avg_a;
    double diff_b = b[i] - avg_b;
    cov += diff_a * diff_b;
    v_a += diff_a * diff_a;
    v_b += diff_b * diff_b;
  }
  return cov / sqrt(v_a * v_b);
}