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BigInteger.Log Method (BigInteger)

Returns the natural (base e) logarithm of a specified number.

Namespace:  System.Numerics
Assemblies:   System.Runtime.Numerics (in System.Runtime.Numerics.dll)
  System.Numerics (in System.Numerics.dll)

public static double Log(
	BigInteger value
)

Parameters

value
Type: System.Numerics.BigInteger

The number whose logarithm is to be found.

Return Value

Type: System.Double
The natural (base e) logarithm of value, as shown in the table in the Remarks section.

ExceptionCondition
ArgumentOutOfRangeException

The natural log of value is out of range of the Double data type.

The value parameter is specified as a base 10 number.

The precise return value of this method depends on the sign of value, as the following table shows.

Sign of value parameter

Return value

Positive

The natural logarithm of value; that is, ln value, or log e value.

Zero

NegativeInfinity.

Negative

NaN.

To calculate the base 10 logarithm of a BigInteger value, call the Log10 method. To calculate the logarithm of a number in another base, call the Log(BigInteger, Double) method.

You can find the square root of a number by calling the Log method along with the Math.Exp method. Note that the result is Double.PositiveInfinity if the result is greater than Double.MaxValue. The following example calculates the square root of each element in an array of BigInteger values.

using System;
using System.Numerics;

public class Example
{
   public static void Main()
   {
      BigInteger[] values = { 2, 100, BigInteger.Pow(1000, 100), 
                              BigInteger.Pow(2, 64) };
      foreach (var value in values)                                    
         Console.WriteLine("The square root of {0} is {1}", value, 
                           Math.Exp(BigInteger.Log(value) / 2));
   }
}
// The example displays the following output: 
//    The square root of 2 is 1.41421356237309 
//    The square root of 100 is 10 
//    The square root of 1000000000000000000000000000000000000000000000000000000000000 
//    00000000000000000000000000000000000000000000000000000000000000000000000000000000 
//    00000000000000000000000000000000000000000000000000000000000000000000000000000000 
//    00000000000000000000000000000000000000000000000000000000000000000000000000000000 
//     is 9.99999999999988E+149 
//    The square root of 18446744073709551616 is 4294967296

This method corresponds to the Math.Log(Double) method for the primitive numeric types.

.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1
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