mathx

func Beta ¶

func Beta(a, b float64) float64

Beta returns the value of the complete beta function B(a, b).

func BetaInc ¶

func BetaInc(x, a, b float64) float64

BetaInc returns the value of the regularized incomplete beta function Iₓ(a, b).

This is not to be confused with the "incomplete beta function", which can be computed as BetaInc(x, a, b)*Beta(a, b).

If x < 0 or x > 1, returns NaN.

func Choose ¶

func Choose(n, k int) float64

Choose returns the binomial coefficient of n and k.

func Lchoose ¶

func Lchoose(n, k int) float64

Lchoose returns math.Log(Choose(n, k)).

func Sign ¶

func Sign(x float64) float64

Sign returns the sign of x: -1 if x < 0, 0 if x == 0, 1 if x > 0. If x is NaN, it returns NaN.