BigInteger.Log Method (BigInteger, Double)
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Returns the logarithm of a specified number in a specified base.
Namespace: System.Numerics
Assembly: System.Numerics (in System.Numerics.dll)
Syntax
'Declaration
Public Shared Function Log ( _
value As BigInteger, _
baseValue As Double _
) As Double
public static double Log(
BigInteger value,
double baseValue
)
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.Double
The base baseValue logarithm of value, as shown in the table in the Remarks section.
Exceptions
| Exception | Condition |
|---|---|
| ArgumentOutOfRangeException | The log of value is out of range of the Double data type. |
Remarks
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.
Version Information
Silverlight
Supported in: 5, 4
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.