C#，数值计算——伽马微分（Gammadev）的计算方法与源程序

1 文本格式

using System;

namespace Legalsoft.Truffer
{
    public class Gammadev : Normaldev
    {
        private double alph { get; set; }
        private double oalph { get; set; }
        private double bet { get; set; }
        private double a1 { get; set; }
        private double a2 { get; set; }

        public Gammadev(double aalph, double bbet, ulong i) : base(0.0, 1.0, i)
        {
            this.alph = aalph;
            this.oalph = aalph;
            this.bet = bbet;
            if (alph <= 0.0)
            {
                throw new Exception("bad alph in Gammadev");
            }
            if (alph < 1.0)
            {
                alph += 1.0;
            }
            a1 = alph - 1.0 / 3.0;
            a2 = 1.0 / Math.Sqrt(9.0 * a1);
        }

        public new double dev()
        {
            double u;
            double v;
            double x;
            do
            {
                do
                {
                    x = base.dev();
                    v = 1.0 + a2 * x;
                } while (v <= 0.0);
                v = v * v * v;
                u = doub();
            } while (u > 1.0 - 0.331 * Globals.SQR(Globals.SQR(x)) && Math.Log(u) > 0.5 * Globals.SQR(x) + a1 * (1.0 - v + Math.Log(v)));
            //if (alph == oalph)
            if (Math.Abs(alph - oalph) <= float.Epsilon)
            {
                return a1 * v / bet;
            }
            else
            {
                do
                {
                    u = doub();
                } while (Math.Abs(u) <= float.Epsilon);//  (u == 0.0);               
                return Math.Pow(u, 1.0 / oalph) * a1 * v / bet;
            }
        }
    }
}

2 代码格式

using System;namespace Legalsoft.Truffer
{public class Gammadev : Normaldev{private double alph { get; set; }private double oalph { get; set; }private double bet { get; set; }private double a1 { get; set; }private double a2 { get; set; }public Gammadev(double aalph, double bbet, ulong i) : base(0.0, 1.0, i){this.alph = aalph;this.oalph = aalph;this.bet = bbet;if (alph <= 0.0){throw new Exception("bad alph in Gammadev");}if (alph < 1.0){alph += 1.0;}a1 = alph - 1.0 / 3.0;a2 = 1.0 / Math.Sqrt(9.0 * a1);}public new double dev(){double u;double v;double x;do{do{x = base.dev();v = 1.0 + a2 * x;} while (v <= 0.0);v = v * v * v;u = doub();} while (u > 1.0 - 0.331 * Globals.SQR(Globals.SQR(x)) && Math.Log(u) > 0.5 * Globals.SQR(x) + a1 * (1.0 - v + Math.Log(v)));//if (alph == oalph)if (Math.Abs(alph - oalph) <= float.Epsilon){return a1 * v / bet;}else{do{u = doub();} while (Math.Abs(u) <= float.Epsilon);//  (u == 0.0);               return Math.Pow(u, 1.0 / oalph) * a1 * v / bet;}}}
}