BigInteger::Log Method (BigInteger, Double)
Returns the logarithm of a specified number in a specified base.
Assembly: System.Numerics (in System.Numerics.dll)
Parameters
- value
-
Type:
System.Numerics::BigInteger
A number whose logarithm is to be found.
- baseValue
-
Type:
System::Double
The base of the logarithm.
Return Value
Type: System::DoubleThe base baseValue logarithm of value, as shown in the table in the Remarks section.
| Exception | Condition |
|---|---|
| ArgumentOutOfRangeException | The log of value is out of range of the Double data type. |
The value and baseValue parameters are specified as base 10 numbers.
The precise return value of the method depends on the sign of value and on the sign and value of baseValue, as the following table shows.
value parameter | baseValue parameter | Return value |
|---|---|---|
value > 0 | (0 < baseValue < 1) -or-(baseValue > 1) | logbaseValue(value) |
value < 0 | (any value) | |
(any value) | baseValue < 0 | |
value != 1 | baseValue = 0 | |
value != 1 | baseValue = Double::PositiveInfinity | |
(any value) | baseValue = Double::NaN | |
(any value) | baseValue = 1 | |
value = 0 | 0 < baseValue < 1 | |
value = 0 | baseValue > 1 | |
value = 1 | baseValue = 0 | 0 |
value = 1 | baseValue = Double::PositiveInfinity | 0 |
To calculate the base 10 logarithm of a BigInteger value, call the Log10 method. To calculate the natural logarithm of a number, call the Log(BigInteger) method.
This method corresponds to the Math::Log method for the primitive numeric types.
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 4.0
Windows Phone
Available since 8.1