igammac {dsdp}

Complementary Incomplete Gamma Function

Description

Evaluate an complementary incomplete gamma function:

\gamma^{*}(a, x) = \int_{x}^{\infty} t^{a-1} e^{-t}dt,

using SLATEC dgamic in https://netlib.org/slatec/. When (x > 0 and a \ge 0) or (x \ge 0 and a > 0), compute the result, otherwise the value is NaN.

Usage

igammac(a, x)

Arguments

a

A numeric vector.

x

A nonnegative numeric vector with same length as a.

Value

A vector of values of a complementary incomplete gamma function.

See Also

igamma()

Examples

igammac(1, 1)