Function stddev

examples/benchmark_statistical.cpp:30–35

}

double stddev(data_t data, double average) {
    double sum = 0;
    std::for_each(data->begin(), data->end(),
                  [average,&sum](double x) { sum += std::pow(x - average, 2.); });
    return std::sqrt(sum / static_cast<double>(data->size()));
}

double median(data_t data) {
    auto copy = *data;