Complex.FromPolarCoordinates(Double, Double) 方法

定义

命名空间:

System.Numerics

程序集:

System.Runtime.Numerics.dll

Source:

Complex.cs

从点的极坐标创建复数。

public:
 static System::Numerics::Complex FromPolarCoordinates(double magnitude, double phase);

public static System.Numerics.Complex FromPolarCoordinates (double magnitude, double phase);

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

Public Shared Function FromPolarCoordinates (magnitude As Double, phase As Double) As Complex

参数

magnitude

Double

数量级，即距离原点（x 轴和 y 轴的交集）到数字的距离。

phase

Double

该阶段（从线条到水平轴的角度）以弧度度量。

返回

Complex

复数。

示例

以下示例使用 FromPolarCoordinates 方法根据其极坐标实例化复数，然后显示其 Magnitude 和 Phase 属性的值。

using System;
using System.Numerics;

public class Example
{
   public static void Main()
   {
      Complex c1 = Complex.FromPolarCoordinates(10, 45 * Math.PI / 180);
      Console.WriteLine("{0}:", c1);
      Console.WriteLine("   Magnitude: {0}", Complex.Abs(c1));
      Console.WriteLine("   Phase:     {0} radians", c1.Phase);
      Console.WriteLine("   Phase      {0} degrees", c1.Phase * 180/Math.PI);
      Console.WriteLine("   Atan(b/a): {0}", Math.Atan(c1.Imaginary/c1.Real));
   }
}
// The example displays the following output:
//       (7.07106781186548, 7.07106781186547):
//          Magnitude: 10
//          Phase:     0.785398163397448 radians
//          Phase      45 degrees
//          Atan(b/a): 0.785398163397448

open System
open System.Numerics

let c1 = Complex.FromPolarCoordinates(10., 45. * Math.PI / 180.)
printfn $"{c1}:"
printfn $"   Magnitude: {Complex.Abs(c1)}"
printfn $"   Phase:     {c1.Phase} radians"
printfn $"   Phase      {c1.Phase * 180. / Math.PI} degrees"
printfn $"   Atan(b/a): {Math.Atan(c1.Imaginary / c1.Real)}"
// The example displays the following output:
//       (7.07106781186548, 7.07106781186547):
//          Magnitude: 10
//          Phase:     0.785398163397448 radians
//          Phase      45 degrees
//          Atan(b/a): 0.785398163397448

Imports System.Numerics

Module Example
   Public Sub Main()
      Dim c1 As Complex = Complex.FromPolarCoordinates(10, 45 * Math.Pi / 180)
      Console.WriteLine("{0}:", c1)
      Console.WriteLine("   Magnitude: {0}", Complex.Abs(c1))
      Console.WriteLine("   Phase:     {0} radians", c1.Phase)
      Console.WriteLine("   Phase      {0} degrees", c1.Phase * 180/Math.Pi)
      Console.WriteLine("   Atan(b/a): {0}", Math.Atan(c1.Imaginary/c1.Real))
   End Sub
End Module
' The example displays the following output:
'       (7.07106781186548, 7.07106781186547):
'          Magnitude: 10
'          Phase:     0.785398163397448 radians
'          Phase      45 degrees
'          Atan(b/a): 0.785398163397448

注解

FromPolarCoordinates 方法根据其极坐标实例化复数。

由于复杂平面上存在一个点的多个表示形式，因此规范化 FromPolarCoordinates 方法的返回值。 数量级规范化为正数，相位规范化为PI 到 PI范围内的值。 因此，生成的复数的 Phase 和 Magnitude 属性的值可能不等于 magnitude 和 phase 参数的原始值。

若要将 phase 参数的值从度转换为弧度，请将其乘以 $\frac{\pi}{180}$。

另请参阅

• Magnitude
• Phase