igammac {dsdp} | R Documentation |
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
.
igammac(a, x)
a |
A numeric vector. |
x |
A nonnegative numeric vector with same length as |
A vector of values of a complementary incomplete gamma function.
igammac(1, 1)