从文件C++中查找标准差

#include <iostream>
#include <fstream>
#include <vector>
#include <cmath>

double calculateStandardDeviation(const std::vector<double>& data) {
    double sum = 0.0;
    double mean = 0.0;
    double variance = 0.0;
    double standardDeviation = 0.0;

    // 计算平均值
    for (const auto& value : data) {
        sum += value;
    }
    mean = sum / data.size();

    // 计算方差
    for (const auto& value : data) {
        variance += pow(value - mean, 2);
    }
    variance /= data.size();

    // 计算标准差
    standardDeviation = sqrt(variance);

    return standardDeviation;
}

int main() {
    std::ifstream inputFile("data.txt");
    std::vector<double> data;

    // 读取数据
    double value;
    while (inputFile >> value) {
        data.push_back(value);
    }

    // 计算标准差
    double standardDeviation = calculateStandardDeviation(data);

    std::cout << "标准差: " << standardDeviation << std::endl;

    return 0;
}