vector计算和、均值、方差

double sum = std::accumulate(std::begin(resultSet), std::end(resultSet), 0.0);
    double mean =  sum / resultSet.size(); //均值

    double accum  = 0.0;
    std::for_each (std::begin(resultSet), std::end(resultSet), [&](const double d) {
        accum  += (d-mean)*(d-mean);
    });

    double stdev = sqrt(accum/(resultSet.size()-1)); //方差

标签：std,begin,方差,double,均值,resultSet,vector,accum,mean
来源： https://www.cnblogs.com/almn/p/11353115.html