Math.Log Method (Double)
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Returns the natural (base e) logarithm of a specified number.
Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
<SecuritySafeCriticalAttribute> _
Public Shared Function Log ( _
d As Double _
) As Double
[SecuritySafeCriticalAttribute]
public static double Log(
double d
)
Parameters
- d
Type: System.Double
A number whose logarithm is to be found.
Return Value
Type: System.Double
One of the values in the following table.
Sign of d |
Returns |
|---|---|
Positive |
The natural logarithm of d; that is, ln d, or log ed |
Zero |
|
Negative |
|
Equal to NaN |
|
Equal to PositiveInfinity |
Remarks
Parameter d is specified as a base 10 number.
Examples
The following example uses Log to evaluate certain logarithmic identities for selected values.
Version Information
Silverlight
Supported in: 5, 4, 3
Silverlight for Windows Phone
Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0
XNA Framework
Supported in: Xbox 360, Windows Phone OS 7.0
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.