using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

public static class RandomHelper
{

    //标准正态分布
    public static double Normal()
    {
        Random aa = new Random(Guid.NewGuid().ToString().GetHashCode());
        double s = 0, u = 0, v = 0;
        while (s > 1 || s == 0)
        {
            u = aa.NextDouble() * 2 - 1;
            v = aa.NextDouble() * 2 - 1;
            s = u * u + v * v;
        }
        var z = Math.Sqrt(-2 * Math.Log(s) / s) * u;
        return (z);
    }

    //符合要求的正态分布随机数
    public static double Normal(double miu, double sigma)
    {
        var z = Normal() * sigma + miu;
        return (z);
    }


}