Elementary.CoshM1 Method

Namespace: Numerics.NET
Assembly: Numerics.NET (in Numerics.NET.dll) Version: 9.0.0

C# Copy

public static double CoshM1(
	double x
)

Visual Basic Copy

Public Shared Function CoshM1 ( 
	x As Double
) As Double

C++/CLI Copy

public:
static double CoshM1(
	double x
)

F# Copy

static member CoshM1 : 
        x : float -> float 

Parameters

x  Double

A real number.

Return Value

Double
The hyperbolic cosine of x minus 1.

For values close to 0, the hyperbolic cosine is very close to 1. As a result, the simply subtracting 1 leads to catastrophic cancellation. This method uses an alternative formula that gives accurate results for arbitrary values of x.