uppergamma: upper incomplete gamma function

Source: R/utils.R

This is the tgamma from the boost library

uppergamma(a, z)

Arguments

a

The numeric 'a' parameter in the upper incomplete gamma
z

The numeric 'z' parameter in the upper incomplete gamma

Value

uppergamma results

Details

The uppergamma function is given by:

\(uppergamma(a, z) = \int_{z}^{\infty}t^{a-1}\cdot e^{-t} dt\)

Author

Matthew L. Fidler

Examples


uppergamma(1, 3)
#> [1] 0.04978707

uppergamma(1:3, 3)
#> [1] 0.04978707 0.19914827 0.84638016

uppergamma(1, 1:3)
#> [1] 0.36787944 0.13533528 0.04978707