Sfun.ErfcInverse Method

SfunErfcInverse Method

Returns the inverse of the complementary error function.

Namespace: Imsl.Math
Assembly: ImslCS (in ImslCS.dll) Version: 6.5.2.0

Syntax

public static double ErfcInverse(
	double x
)

Public Shared Function ErfcInverse ( 
	x As Double
) As Double

public:
static double ErfcInverse(
	double x
)

static member ErfcInverse : 
        x : float -> float

Parameters

x: Type: SystemDouble
A double value, $0 \le x \le 2$ .

Return Value

Type: Double
A double value specifying the inverse of the error function of x.

Remarks

The Erfcinverse(x) method computes the inverse of the complementary error function erfc x, defined in Erfc.

Erfcinverse(x) is defined for $0 \lt x \lt 2$ . If $x_{\max } \lt x \lt 2$ , then the answer will be less accurate than half precision. Very approximately,

$x_{\it max} \approx 2 - \sqrt {\varepsilon / (4\pi)}$

where $\varepsilon$ = machine precision (approximately 1.11e-16).

$Plot of ErfcInverse$

Reference

Sfun Class

Imsl.Math Namespace

Other Resources

Example