Syntax

C#
public static double Log1p( double x )

Visual Basic (Declaration)
Public Shared Function Log1p ( _ x As Double _ ) As Double

Visual C++
public: static double Log1p( double x )

A double value representing Log(1+x).

Remarks

Specifically:

${\rm Log1p}(\pm 0)$ returns $\pm 0$ .

${\rm Log1p}(-1)$ returns $-\infty$ .

${\rm Log1p}(x)$ returns NaN, if $x \lt -1$ .

${\rm Log1p}(\pm \infty)$ returns $\pm \infty$ .