jax.scipy.special.gammaincc

jax.scipy.special.gammaincc(a, x)

Regularized upper incomplete gamma function.

LAX-backend implementation of scipy.special.gammaincc().

Original docstring below.

It is defined as

\[Q(a, x) = \frac{1}{\Gamma(a)} \int_x^\infty t^{a - 1}e^{-t} dt\]

for \(a > 0\) and \(x \geq 0\). See [dlmf] for details.

Parameters:

• a (array_like) – Positive parameter

• x (array_like) – Nonnegative argument

• out (ndarray, optional) – Optional output array for the function values

Returns:

Values of the upper incomplete gamma function

Return type:

scalar or ndarray

References

[dlmf]

NIST Digital Library of Mathematical functions https://dlmf.nist.gov/8.2#E4

[boost]

Maddock et. al., “Incomplete Gamma Functions”, https://www.boost.org/doc/libs/1_61_0/libs/math/doc/html/math_toolkit/sf_gamma/igamma.html