invIncGamma.C File Reference

Function to calculate the inverse of the normalised incomplete gamma function. More...

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Namespaces
	Foam
	Namespace for OpenFOAM.

Functions
static scalar	minimaxs (const scalar P)
static scalar	Sn (const scalar a, const scalar x)
static scalar	R (const scalar a, const scalar x)

Detailed Description

Function to calculate the inverse of the normalised incomplete gamma function.

Original source file invIncGamma.C

The algorithm is described in detain in reference:

    DiDonato, A. R., & Morris Jr, A. H. (1986).
    Computation of the incomplete gamma function ratios and their inverse.
    ACM Transactions on Mathematical Software (TOMS), 12(4), 377-393.

All equation numbers in the following code refer to the above text and the algorithm in the function 'invIncGammaRatio_P' is described in section 4.

Definition in file invIncGamma.C.