コード例 #1
0
ファイル: MathV.cs プロジェクト: YanjieHe/VISAP2.0_Advanced
        static BigNumber  Logarithm(BigNumber y)
        { // y in ( -0.05-, 0.05+ ), return ln((1+y)/(1-y))
            BigNumber v = (new BigNumber("1")), y2 = y * y, t = y2, z = t / (new BigNumber("3"));

            for (BigNumber i = new BigNumber("3"); CompareNumber.Compare(z, new BigNumber("0")) != 0;
                 z = (t *= y2) / (i += new BigNumber("2")))
            {
                v += z;
            }
            return(v * y * (new BigNumber("2")));
        }
コード例 #2
0
 //判定小于
 public static bool operator <(BigNumber x1, BigNumber x2)
 {
     if (CompareNumber.Compare(x1, x2) == -1)
     {
         return(true);
     }
     else
     {
         return(false);
     }
 }
コード例 #3
0
ファイル: MathV.cs プロジェクト: YanjieHe/VISAP2.0_Advanced
        public static BigNumber Log(BigNumber x)
        {
            if (CompareNumber.Compare(x, new BigNumber("0")) == -1 || CompareNumber.Compare(x, new BigNumber("0")) == 0)
            {
                throw new ArgumentException("Must be positive");
            }
            int k = 0, l = 0;

            for (; CompareNumber.Compare(x, new BigNumber("1")) == 1; k++)
            {
                x /= new BigNumber("10");
            }
            for (; CompareNumber.Compare(x, new BigNumber("0.1")) == -1; k--)
            {
                x *= new BigNumber("10");                                                                      // ( 0.1, 1 ]
            }
            for (; CompareNumber.Compare(x, new BigNumber("0.9047")) == -1; l--)
            {
                x *= new BigNumber("1.2217");                                                                  // [ 0.9047, 1.10527199 )
            }
            return(k * ln10 + l * lnr + Logarithm((x - new BigNumber("1")) / (x + new BigNumber("1"))));
        }
コード例 #4
0
 public int CompareTo(BigNumber other)
 {
     return(CompareNumber.Compare(this, other));
 }