public static double g01ft(
	double x,
	out int ifail
)

Public Shared Function g01ft ( _
	x As Double, _
	<OutAttribute> ByRef ifail As Integer _
) As Double

public:
static double g01ft(
	double x, 
	[OutAttribute] int% ifail
)

static member g01ft : 
        x : float * 
        ifail : int byref -> float 

g01ft returns the value of the inverse ${\Phi }^{-1}\left(x\right)$ of the Landau distribution function.

g01ft evaluates an approximation to the inverse ${\Phi }^{-1}\left(x\right)$ of the Landau distribution function given by (where $\Phi \left(\lambda \right)$ is described in g01et and g01mt), using either linear or quadratic interpolation or rational approximations which mimic the asymptotic behaviour. Further details can be found in Kölbig and Schorr (1984).

It can also be used to generate Landau distributed random numbers in the range $0<x<1$.

Kölbig K S and Schorr B (1984) A program package for the Landau distribution Comp. Phys. Comm. 31 97–111

Errors or warnings detected by the method:

At least $5-6$ significant digits are correct. Such accuracy is normally considered to be adequate for applications in large scale Monte–Carlo simulations.

None.

None.

This example evaluates ${\Phi }^{-1}\left(x\right)$ at $x=0.5$, and prints the results.