Complex.Log 方法

定義

命名空間:

System.Numerics

組件:

netstandard.dll, System.Runtime.Numerics.dll

返回複數的對數。

多載

名稱	Description
Log(Complex)	回傳指定複數的自然（基底 e）對數。
Log(Complex, Double)	回傳指定複數在指定基底下的對數。

Log(Complex)

來源:

Complex.cs

回傳指定複數的自然（基底 e）對數。

public:
 static System::Numerics::Complex Log(System::Numerics::Complex value);

public static System.Numerics.Complex Log(System.Numerics.Complex value);

static member Log : System.Numerics.Complex -> System.Numerics.Complex

Public Shared Function Log (value As Complex) As Complex

參數

value

Complex

複數。

傳回

Complex

的e自然（基底value）對數。

範例

以下範例說明此 Log 方法。 它顯示，在考慮資料型別精度 Double 不足的因素後，將方法回傳 Log 的值傳給方法 Exp 會返回原始 Complex 值。

using System;
using System.Numerics;

public class Example
{
   public static void Main()
   {
      Complex[] values = { new Complex(1.53, 9.26), 
                           new Complex(2.53, -8.12),
                           new Complex(-2.81, 5.32),
                           new Complex(-1.09, -3.43),
                           new Complex(Double.MinValue/2, Double.MinValue/2) };
      foreach (Complex value in values)
         Console.WriteLine("Exp(Log({0}) = {1}", value, 
                           Complex.Exp(Complex.Log(value)));
   }
}
// The example displays the following output:
//       Exp(Log((1.53, 9.26)) = (1.53, 9.26)
//       Exp(Log((2.53, -8.12)) = (2.53, -8.12)
//       Exp(Log((-2.81, 5.32)) = (-2.81, 5.32)
//       Exp(Log((-1.09, -3.43)) = (-1.09, -3.43)
//       Exp(Log((-8.98846567431158E+307, -8.98846567431158E+307)) = (-8.98846567431161E+307, -8.98846567431161E+307)

open System
open System.Numerics

let values =
    [ Complex(1.53, 9.26)
      Complex(2.53, -8.12)
      Complex(-2.81, 5.32)
      Complex(-1.09, -3.43)
      Complex(Double.MinValue / 2.0, Double.MinValue / 2.0) ]

for value in values do
    printfn $"Exp(Log({value}) = {Complex.Exp(Complex.Log(value))}"
// The example displays the following output:
//       Exp(Log((1.53, 9.26)) = (1.53, 9.26)
//       Exp(Log((2.53, -8.12)) = (2.53, -8.12)
//       Exp(Log((-2.81, 5.32)) = (-2.81, 5.32)
//       Exp(Log((-1.09, -3.43)) = (-1.09, -3.43)
//       Exp(Log((-8.98846567431158E+307, -8.98846567431158E+307)) = (-8.98846567431161E+307, -8.98846567431161E+307)

Imports System.Numerics

Module Example
   Public Sub Main()
      Dim values() As Complex = { New Complex(1.53, 9.26), 
                                  New Complex(2.53, -8.12),
                                  New Complex(-2.81, 5.32),
                                  New Complex(-1.09, -3.43),
                                  New Complex(Double.MinValue/2, Double.MinValue/2) }
      For Each value As Complex In values
         Console.WriteLine("Exp(Log({0}) = {1}", value, 
                           Complex.Exp(Complex.Log(value)))
      Next                                  
   End Sub
End Module
' The example displays the following output:
'      Exp(Log((1.53, 9.26)) = (1.53, 9.26)
'      Exp(Log((2.53, -8.12)) = (2.53, -8.12)
'      Exp(Log((-2.81, 5.32)) = (-2.81, 5.32)
'      Exp(Log((-1.09, -3.43)) = (-1.09, -3.43)
'      Exp(Log((-8.98846567431158E+307, -8.98846567431158E+307)) = (-8.98846567431161E+307, -8.98846567431161E+307)

備註

Log(Complex)複數的方法對應Math.Log(Double)於實數的方法。

另請參閱

• Log(Double)
• Exp(Complex)

Log(Complex, Double)

來源:

Complex.cs

回傳指定複數在指定基底下的對數。

public:
 static System::Numerics::Complex Log(System::Numerics::Complex value, double baseValue);

public static System.Numerics.Complex Log(System.Numerics.Complex value, double baseValue);

static member Log : System.Numerics.Complex * double -> System.Numerics.Complex

Public Shared Function Log (value As Complex, baseValue As Double) As Complex

參數

value

Complex

複數。

baseValue

Double

對數的基底。

傳回

Complex

在基數value中 的baseValue對數。

備註

Log(Complex, Double)複數的方法對應Math.Log(Double, Double)於實數的方法。