Elementary.Log1PlusX Method

Returns the logarithm of 1 plus the argument.

Definition

Namespace: Extreme.Mathematics
Assembly: Extreme.Numerics (in Extreme.Numerics.dll) Version: 8.1.23
C#
public static double Log1PlusX(
	double x
)

Parameters

x  Double
A real number greater than -1.

Return Value

Double
The logarithm of 1 plus x.

Remarks

For small values of x, the logarithm of 1 + x is close to zero. When the logarithm is evaluated directly, this can cause significant round-off error. This function resolves this problem by using a direct approximations for x close to 1.

Exceptions

ArgumentOutOfRangeExceptionx is less than or equal to -1.

See Also